--- title: Ad Group — definition and structure in Google Ads | Siite description: "Ad groups explained: what belongs in one, why tight themes lower click costs, and how account structure should follow the services you sell." url: "https://siite.co/dictionary/ad-group" type: static generatedAt: "2026-10-22T08:21:10.737Z" --- Paid Media # Ad Group A container inside a Google Ads campaign holding one tight set of keywords and the ads written to answer them — the unit that keeps ads relevant to what was searched. Also goes by Adgroup [![Siite](/images/layout/logo.svg)Written by Siite](/about/)Updated September 8, 2026 ## Entry contents [All Terms A to Z←Browse the full dictionary](/dictionary/) A Google Ads account has three layers. The account holds campaigns, campaigns hold ad groups, and ad groups hold keywords and the ads written for them. The ad group is where relevance is won or lost, because every keyword inside it has to be answered by the same handful of ads. > **Briefly explained** > > - One theme of keywords, plus the ads that answer them. > - Campaigns hold budget and targeting. Ad groups hold relevance. > - Tight groups let one ad speak to every keyword in it. > - Both extremes fail: one group for everything, or one group per keyword. ## What belongs in one? Keywords that a single ad can answer without stretching. If you would write different headlines for two keywords, they belong in different groups. A useful test: read your ad, then read each keyword in the group. If any of them makes the ad sound vague or beside the point, it is in the wrong place. ## Why does tightness lower the cost? Because position is decided by bid and relevance together. When one group holds three unrelated services, no ad can speak to all three, click-through rate falls, and the account pays more for worse positions. See [Quality Score](/dictionary/quality-score/). Tight groups also give you three things that have nothing to do with price: - Ads that repeat the searcher’s own words - A [landing page](/dictionary/landing-page/) per theme, about that exact job - Numbers per service, so you can see which work the budget is buying ## How does structure usually go wrong? The same two mistakes turn up in most accounts. - **The single-group account.** Everything in one bucket, one generic ad, one home page. It is quick to build and it quietly overpays on every click. - **Over-splitting.** Dozens of one-keyword groups, none with enough data for anyone, including Google’s bidding, to learn from. Group them the way you sell the work, one theme at a time. ## What do the terms mean? - **Campaign:** The level that controls spending, targeting and timing. - **Responsive search ad:** The default ad format, where you supply headlines and descriptions and Google assembles combinations. - **Final URL:** The page the ad sends people to. - **Theme:** The single idea an ad group covers. - **[Match type](/dictionary/match-type/):** How loosely each keyword in the group may be interpreted. Owner questions ## What owners ask us about Ad Group ### What is the right number of keywords? +Few enough that a single ad can speak to every one of them without stretching. In practice that is a small set of close variants rather than a long list of vaguely related ones. ### How many ads belong in one group? +Two or three responsive search ads is normal. Enough for Google to have something to test, not so many that no version ever gathers meaningful data. ### Does every service need its own group? +Usually. Different services are different jobs at different prices, and they deserve different ads and different landing pages. ### Should I split by city as well as by service? +Only if the wording or the offer really differs by city. Otherwise use location targeting and keep the structure simple enough to read. ### What is the difference between a campaign and an ad group? +Budget, locations and schedule all live at campaign level. Keywords and ads live in the group. Money is set above, relevance is won below.Put this to work ## Guides that use this Step-by-step playbooks from the team, written for owners doing the work themselves. No sign-up and no email required. [### LSAs vs Google Ads for Austin plumbers: when each one wins Local Service Ads pay per lead, Google Ads pay per click. The right answer for a plumber depends on the season. The math from $6.7M in observed spend. Read the guide→](/articles/lsa-vs-google-ads-austin-plumbers/)4.9191 reviewsWhere this turns into work ## Structure that earns its position One theme per ad group, ads written in the customer's own words, and a page per service behind them. The structure that makes every other lever work. [See the service→](/services/google-ads/)[Ask us about it](/contact/) ![Mikkel Friis, Marketing Manager at Siite](/images/team/panel/mikkel-friis.webp) *Our marketing manager* ## Related entries - [### Quality Score Google Ads' 1-10 diagnostic estimating how relevant your keyword, ad and landing page are to a searcher — better relevance generally means a lower cost per click.](/dictionary/quality-score/) - [### Negative Keyword A term you exclude from a Google Ads campaign so your ads never show for it — the main tool for stopping spend on searches that cannot become jobs.](/dictionary/negative-keyword/) - [### Match Type The setting that controls how closely a search must resemble your keyword before your ad can show — broad, phrase or exact, from loosest to tightest.](/dictionary/match-type/) - [### Landing Page The page a visitor arrives on from an ad, listing or link — built to answer one search and produce one action, rather than to introduce the whole company.](/dictionary/landing-page/) [All terms A to Z Browse every term A to Z Open the dictionary→](/dictionary/)