Guide
What Is a Job Ad? The Definition, the Nine Parts, and One Taken Apart
A job ad, a job advertisement and a job posting are three names for the same document, and none of them is a job description. Here is the definition in one sentence, the nine parts in the order people read them, a real ad labelled part by part, and the table that tells you which of the three you are actually writing.
Job ad
A job ad is the public advertisement for an open role: a short, paid piece of writing that markets one job to people who were not looking for it.
A job ad is the public advertisement for an open role. It is a short, paid piece of writing that markets one job to people who were not looking for it, on the channels they already use. Job advertisement is the formal name for the same thing. Job posting and job listing are what it gets called once it is sitting on a board.
What it is not is a job description. A job description is an internal document that defines what a role is, who it reports to and what it is paid, and it exists whether or not anyone is hiring. An ad is written to be read once, by a stranger, at speed. The two get confused constantly, and the most common way a job ad fails is that somebody pasted the description into the ad slot and published it.
This page gives the definition, the nine parts a job ad contains, a real ad of ours labelled part by part, a table that separates the three documents on six axes, and a six-step method for writing one. Everything with a number attached to it names where the number came from.
On this page
- Job ad, job advertisement, job posting and job listing: the same document
- Job advertisement format: the nine parts of a job ad
- A real job ad, labelled part by part
- Job ad vs job description vs job posting
- How to write a job ad, in six steps
- Types of job advertisement, and where each one runs
- Questions about job ads
- Turn the job post into an ad that runs
Job ad, job advertisement, job posting and job listing: the same document
Four names, one document, and the differences between them are about where you are standing rather than what you are writing. This trips people up more than it should, because half the pages that answer this question answer it about a different word than the one you typed.
- Job ad
- The everyday name, and the one that carries the marketing sense. When someone says job ad they usually mean the version that costs money to distribute: the thing running in a feed, on a board, or in print. In practice it is used loosely for all four.
- Job advertisement
- The formal version of the same word. Job advert, or just advert, is the standard British usage and means exactly the same thing. Nothing distinguishes an advertisement from an ad except register.
- Job posting
- What the ad is called once it has been posted somewhere it will sit and wait: a board, an aggregator, your own site. It is the applicant tracking system's word, which is why HR teams use it most. A posting is usually longer than an ad, because the person reading it went looking for it.
- Job listing
- The board's word for the same object, viewed as an entry in a list. If someone asks what a job listing is, they are asking about a job posting seen from the candidate's side of the search results.
The one useful distinction inside the family is push against pull. A posting or a listing waits to be found: somebody searches, filters, and reads. An ad is pushed in front of people who never typed a search, which is why it has to earn attention before it can say anything about the role. That difference decides how long the writing is and what goes in the first line, and it is the difference the rest of this page is organised around.
Job advertisement format: the nine parts of a job ad
Nine blocks, in the order they get read. Not every job needs all nine, and a four-hour weekend shift and a senior salaried hire are not the same document. Delete what does not apply, but keep the order, because the order is what makes an ad readable at speed.
The nine parts of a job ad
job-ad-structure.txt
The job title
The only line most people will read.
Write the title the job is called in the outside world, not the one your grading system calls it. Internal titles like Associate II or Specialist Grade 4 mean nothing to a stranger and get filtered out of every search that would have found them. If the internal title has to appear somewhere, put it further down and let the searchable one carry the heading.
The hook
Left off the standard listsOne sentence whose only job is to earn the next one.
This is the sentence that decides whether the rest gets read, and it is the part almost every glossary leaves off the list. It is one concrete thing about this job that is true and specific: the shift pattern, the team size, the thing you will get to build, the reason the role is open. Not a mission statement, and not a sentence any other employer could have written.
About the role and the employer
Who is hiring, and where this job sits.
Two or three sentences, not a company history. What the organisation does, who this person works with, and what the team is for. The test is whether a reader who has never heard of you could explain the job to a friend after reading it once.
What you will do
The week, in the order the hours actually fall.
Five or six lines, written as the work rather than as duties. Where a task takes most of the week, say so. A week that turns out to be nothing like the one the ad implied is a bad surprise to hand somebody in their first month, and it costs nothing to avoid at the writing stage. Cut anything that is true of every job at your grade.
What you bring
The short list of things that are genuinely required.
Separate what is required from what is useful, and be honest about which is which. A requirements list that runs to twenty lines reads as a high bar and works as an unsorted wish list. It deters the people who could do the job and does nothing to deter the people who cannot. If you would hire someone missing an item, that item is not required.
Pay and benefits
The number, and everything that moves it.
Publish a range, and say what moves someone through it. A growing number of places now require a pay range in the advertised role itself, so check the rule where the job sits before deciding. Benefits are worth listing only where they are specific: a number of days, a real amount, an actual arrangement.
Location and hours
Left off the standard listsWhere the work happens, and when.
The second part the consensus lists leave out, and the one candidates ask about first. Name the site, the number of days on it, the shift pattern or the core hours, and whether any of it is negotiable. Remote, hybrid and on-site are not self-explanatory words, so say what yours means in days.
How to apply
One route in, and what happens after somebody takes it.
One link, one action, and a sentence about what follows: who reads it, roughly how long it takes, and what the next step is. Two competing routes halve the response to both. A closing date is worth publishing only if you intend to hold it.
The equal opportunity line
Left off the standard listsOne honest sentence, and a real offer of adjustments.
The third part the consensus lists leave out. A boilerplate paragraph nobody reads is worth less than one sentence saying who to contact for an adjustment and that asking will not count against anyone. If the sentence is not true, fix the process rather than the sentence.
Six of those nine are on every list. Search this question and you will be told a job ad contains a job title, something about the company, the duties, the requirements, the pay, and how to apply. That is a fair summary of a job posting. It leaves out three of the nine above, and the three it leaves out are the hook, the location and hours, and the equal opportunity line. Those are the parts a candidate decides on, which makes them an odd set of things to omit.
Each of the nine is written out with model wording you can take, in the job ad template. If the role is being advertised to colleagues rather than to the outside world, the internal job posting version is a different document again, with four blocks this one does not have.
A real job ad, labelled part by part
Definitions of a job ad are easy to find and hard to use, because none of them shows you one. This is an ad we made for a client, running in the placement it ran in, with its parts pointed at. It is worth looking at for one reason above all: notice how few of the nine parts survive.
Made with RecruitmentAds.com for Dunhill Professional Search & Government Solutions. Shown in the LinkedIn feed placement it ran in.
The job title
Named in the first frame, before anything else moves. A viewer who scrolls past at this point has still been told what the job is.
The hook
One line, and it is about the work rather than the employer. This is the part that is missing from every glossary list of what a job ad contains.
About the role and the employer
The logo carries this, which is what a logo is for in a feed. It is two seconds of information that would have cost a paragraph in a posting.
How to apply
Inside the safe area, away from the edges where the platform draws its own buttons over your creative.
What the ad has no room for
- What you will do
- What you bring
- Location and hours
- The equal opportunity line
Four blocks made it into the ad. Four more, the duties, the requirements, the hours and the equal opportunity line, are nowhere in it, and that is not an oversight. A feed placement has room for a hook and a title, and everything else has to live one click away. This is the practical reason the ad and the posting are two documents: the ad's job is to earn the click, and the posting's job is to answer everything the ad could not fit.
If what you want is the finished thing rather than the definition, we keep a set of job postings taken apart on their own page.
Job ad vs job description vs job posting
A job description defines the role for the organisation and is never published. A job posting publishes that role and waits to be found. A job ad pushes it in front of people who were not looking. The description says what the job is; the ad says why anyone would want it.
Most pages that answer this answer it two ways: internal document, external document, done. That is true and it is not enough to write from, because it does not tell you how long the thing should be or what it is judged on. Six axes, three documents.
| Axis | Job ad | Job posting | Job description |
|---|---|---|---|
| Who reads it | Somebody who was not looking for a job. It arrives in a feed, between a friend's holiday photo and the news. | Somebody who is already looking, and is filtering. They arrived by searching, so they are reading to rule the job in or out. | Nobody outside the organisation, in the normal case. Managers, HR, and whoever sets pay. |
| Who writes and owns it | Whoever runs recruitment marketing: talent acquisition, employer brand, or the agency. | Talent acquisition, published through the applicant tracking system. | HR, with the hiring manager, and usually signed off by compensation. |
| How long it lives | A campaign flight. Days or weeks, then it is replaced or switched off. | Until the role is filled or withdrawn. | The life of the role, across many hires, many people and several reorganisations. |
| Where it goes | Paid placements: social feeds, video, search, sometimes print and out of home. | Job boards, your own career page, and the aggregators that scrape both. | The HR system. It is not published anywhere. |
| What it is judged on | Cost per qualified application, and whether anybody stopped scrolling at all. | Applications started against applications finished, and where in the form people give up. | Nothing. It is a reference document, and it is judged only when somebody disputes what the job is. |
| How long it is | A headline, a line or two of body, one call to action. The placement sets the limit, not you. | Several hundred words. Completeness beats brevity here, because the reader chose to be here. | As long as the role needs. Nobody is skimming it in a feed. |
The failure mode is always the same direction. Somebody has a job description, a requisition to fill and no time, so the description becomes the posting and the posting becomes the ad. What gets published is a document written for compensation review, addressed to a stranger, in a feed. It is accurate, complete, and nobody reads it.
A fourth document exists and is worth keeping separate: the internal job posting, written to colleagues who already work for you. It has to answer things an external ad never mentions, starting with who is eligible and what happens to the job the applicant is doing now.
How to write a job ad, in six steps
Writing a good job ad is mostly a subtraction problem. You will have a job description in front of you, and the work is deciding what not to carry across. Six steps, in order.
Start from the job description, and expect to keep very little of it. Read it once and pull out three things: what this person will actually spend the week doing, the two or three requirements that are genuinely non-negotiable, and the pay range. Everything else is context for the organisation and not for the reader.
Find the one true, specific thing. There is always something about a job that is concrete and not true of the job next door: the shift pattern, the size of the team, the equipment, the thing this person gets to build, the reason the role is open. That is your hook. If you cannot find one, that is worth knowing before you spend money advertising it.
Write the title the way the outside world says it. Not the grading-system title. If nobody outside your organisation would type it into a search box, it will not be found, and it will not be understood when it is.
Cut the requirements list until it hurts. Go through it once and ask of each line whether you would genuinely turn down someone who was missing it. The ones where the answer is no are not requirements, and leaving them in reliably deters the people who could do the job.
Publish the pay. A range, and one line about what moves somebody through it. Check the rule where the job sits first, because a growing number of places now require a range in the advertised role rather than leaving it to preference.
Give one way in, and say what happens next. One link, one action, and a sentence about who reads the application and roughly how long it takes. The apply link should land on the role itself and not on a career page the reader then has to search.
What to leave out
Four things that make an ad worse in a way that is hard to see from the inside:
Job titles nobody uses. Ninja, rockstar, guru, wizard. They read as a substitute for a description of the work, which is usually what they are.
The requirements list that runs to twenty lines. It reads as a high bar and works as an unsorted wish list, and it filters out people who would have been good at the job while filtering in nobody.
Other duties as assigned. Everybody knows what it means and nobody has ever been reassured by it.
Three paragraphs about the company before anything about the job. The reader has not decided to care about you yet. Earn it with the role first.
That is the whole method. It fits on one page because most of the difficulty in writing a job ad is not writing, it is deciding what the job actually offers and being willing to say it plainly.
Types of job advertisement, and where each one runs
Eight places a job ad can run, what each one is actually good at, and what it is bad at. The split that matters is not paid against free, it is whether the format reaches people who are currently looking or people who are not.
Job board listing
The role published on a board, where it waits to be found by somebody searching.
Who sees it. Active candidates who are already looking, in your discipline, this week.
What it is bad at. It reaches nobody who is not currently searching, which on most teams is the large majority of the people you would want to hire.
Career page posting
The same listing on your own site, which is the version aggregators scrape and index.
Who sees it. People who already know your name, plus anyone who arrives from a search engine.
What it is bad at. It only works as hard as the traffic you send it. A career page with no campaign behind it is a filing cabinet.
Video ad
The same feed placement, with motion, sound and the first two seconds doing all the work.
Who sees it. The same passive audience, held slightly longer.
What it is bad at. A talking-head video with no captions is a silent video, because most feeds start muted.
The same job post becomes a recruitment video when the placement is a feed rather than a board.
Search ad
A paid result against the queries people type when they are already hunting for this job.
Who sees it. Active candidates, at the moment of highest intent.
What it is bad at. It competes with the boards on their own ground, and they buy those keywords with a much larger budget than yours.
Programmatic board buying
Board placements bought algorithmically and priced by the click or the application rather than the slot.
Who sees it. Active candidates, at volume, across many boards at once.
What it is bad at. It optimises for the application, which is not the same thing as optimising for the hire. Watch what happens after the click.
Buying board placements by the click or the application, algorithmically, is programmatic job advertising.
Print and out of home
The oldest format on the list: newspapers, posters, fliers, vehicle livery, boards at the site gate.
Who sees it. People who physically pass the thing, which for shift and site-based hiring is often exactly the right people.
What it is bad at. It cannot be measured the way the rest of this list can. Put a distinct link or code on it or you will never know.
Every channel here is one we have run creative on, and fifteen recruitment ads taken apart shows what ran in each.
How much of a job ad actually fits
The feed decides the length, not the role. Two placements, with the figures as the platforms publish them. Note which are hard limits and which are the platform's own advice, because the two get quoted interchangeably everywhere else:
LinkedIn single image ad
A LinkedIn single image ad shows about 150 characters of introductory text before it truncates, on LinkedIn's own published limits.
| Field | What the platform publishes | Hard limit or advice | Source |
|---|---|---|---|
| Introductory text, to avoid truncation | 150 characters, including spaces, emojis and punctuation | Design recommendation | LinkedIn Help Centre, single image ad specificationsRead 16 August 2026. |
| Introductory text, hard maximum | 3,000 characters | Technical requirement | LinkedIn Help Centre, single image ad specificationsRead 16 August 2026. |
| Headline, to avoid truncation | 70 characters | Design recommendation | LinkedIn Help Centre, single image ad specificationsRead 16 August 2026. |
Facebook feed, image
Facebook's feed recommendation is 50 to 150 characters of primary text and a 27-character headline, per what Meta publishes for the feed.
| Field | What the platform publishes | Hard limit or advice | Source |
|---|---|---|---|
| Primary text | 50 to 150 characters | Design recommendation | Meta Ads Guide, Facebook feed imageRead 16 August 2026. |
| Headline | 27 characters | Design recommendation | Meta Ads Guide, Facebook feed imageRead 16 August 2026. |
So a LinkedIn job ad has about 150 characters before a reader has to tap to see the rest, and a Facebook feed headline has 27. That is roughly one sentence and about four words. It is the clearest possible argument that the ad and the posting cannot be the same document, and it is checkable: every figure above links to the page it was read from and the date it was read.
Questions about job ads
What is an ad for a job?
It is the public advertisement for a role somebody is hiring for: a short piece of paid writing that markets one job to people who were not looking for it. It carries the title, one specific reason to be interested, enough about the employer to place it, the pay, and one way to apply. Job advertisement is the formal name, job advert the British one, and job posting what it gets called once it is sitting on a board waiting to be found.
What is considered a job posting?
Any published listing of a specific open role that a candidate can find and apply to, whether it sits on a job board, on your own careers site, or on an aggregator that scraped one of the two. The test is that it names a real role and offers a route in. A general expression-of-interest page is not a job posting, and neither is an internal note about a role you have not opened yet.
How long should a job ad be?
Shorter than you think, and the placement decides rather than you. A LinkedIn single image ad shows about 150 characters of introductory text before it truncates, on LinkedIn's own recommendation, against a 3,000-character hard maximum. Meta recommends 50 to 150 characters of primary text and a 27-character headline for the Facebook feed. A job posting on a board is a different length problem entirely, because the reader chose to be there: several hundred words is normal and completeness beats brevity.
How long does a job posting last?
Until you close it, in most systems, though boards and aggregators apply their own expiry and quietly drop listings that look stale. We have no data saying one window outperforms another. What decides it in practice is whether you can hold the closing date you published: pick one you will not move, put it in the posting, and say what happens after it passes. A posting that has visibly been open for months tells candidates something you probably did not intend.
How do you know if a job posting is fake?
This gets asked from the candidate's side, and it is worth answering from yours, because the tells are things a genuine posting does by accident. No named team or location. A range so wide it says nothing. A description that could belong to any employer. A role that has been open for months with no update. An apply route that leads somewhere generic rather than to the role. Candidates now read all five as signs of a ghost job, a listing nobody intends to fill, and the search volume on that phrase has not fallen. If your posting has three of the five, it will be read as one whatever your intent.
What is job posting in recruitment?
It is the step where an approved, defined role becomes something the public can see and apply to. Practically it means taking the job description, cutting it down into something a stranger can read, publishing it through your applicant tracking system to your careers site and whichever boards you buy, and opening the application route. Everything before it is approval and definition. Everything after it is sourcing, screening and selection.
What is ad in workplace?
It depends entirely on context, and the two common meanings have nothing to do with each other. In recruitment, ad is short for advertisement, so a job ad is the advertisement for a role. In IT it almost always means Active Directory, the system that holds staff accounts and permissions. If somebody in an HR conversation says the ad is live they mean the job advertisement; if somebody in an IT conversation says check AD they do not.
What is a job ad for students?
The same document, with three things done differently. Say what the work actually is rather than describing it in the language of a career the reader has not had yet. Be explicit about hours, because a student is fitting the job around something fixed and cannot guess. And write the requirements as the things somebody will learn on the job rather than as prior experience, since asking for two years of it in an entry-level role is the fastest way to get no applications at all.
Turn the job post into an ad that runs
Everything above ends at the same place: you have a job post that says the whole thing, and a feed with room for a headline. Paste the job post into RecruitmentAds.com and it comes back as a finished ad set, video and static, inside your brand template and sized for the placements you are going to run it in. The posting keeps the detail. The ad gets the attention. That is the division of labour this page is about.
Niels Geominy, Founder, RecruitmentAds.com
Published 1 September 2026. Last updated 1 September 2026. Every character limit on this page is quoted from the platform’s own documentation with the link and the date it was read beside it, and the ad shown above is one we made for a client and already publish on this site. Nothing here is a figure we estimated.