Advertising
What is an ad group in Google Ads?
Copy for AI
An ad group is the layer in your Google Ads account that bundles a set of keywords and their matching ads around a shared theme. It is the level where relevance is created: a tightly defined ad group makes sure the searcher sees exactly the ad that fits their query. In this article you will read what an ad group is, where it sits in the structure of a campaign and how to build one smartly for B2B.
What is an ad group exactly?
To understand an ad group, you need to know how a Google Ads account is built. According to Google Ads Help, your account is organised in three layers: the account, the campaigns and the ad groups. The ad group therefore sits in the middle.
- Account: your overarching profile with billing, time zone and settings.
- Campaign: determines your budget, your bidding strategy and where your ads appear. A campaign contains one or more ad groups.
- Ad group: bundles keywords and ads around a single theme.
Two things belong inside an ad group: the keywords (the terms you want to be found for) and the ads (what the searcher gets to see). Google recommends that the ads in an ad group match the keywords in that same group. That is the core of it: the closer your keyword and ad copy sit together, the more relevant your ad comes across.
The table below makes the division of roles concrete. Each layer steers something different, and that determines which dial to turn when something is not working.
| Layer | What you set here | What you steer | Example |
|---|---|---|---|
| Account | Billing, time zone, users | Overarching management | One account for the whole company |
| Campaign | Budget, bidding strategy, locations, network | How much you spend and where you appear | Campaign “Accounting software BE” with a daily budget |
| Ad group | Theme, keywords, ads | Relevance and Quality Score | Ad group “accounting software construction” |
| Keyword + ad | Match type, bids, ad copy | The exact match with the searcher | Keyword “accounting package construction company” + a fitting ad |
As you can see, the ad group is the hinge: the campaign above it handles money and reach, the layer below it handles the exact match. If you want to dig further into the keyword layer, read up on how keyword match types determine when your ad appears.
Why does your ad group structure matter?
A good ad group structure is not an administrative luxury, it hits your results directly. If you throw too many diverging keywords into one group, your ad can never be equally relevant for all of them. That drags down your Quality Score and drives your cost per click up.
Concretely, a tight structure gets you this:
- Higher relevance. If someone searches for “accounting software for construction companies” and that term sits in a separate ad group with an ad that names exactly that, the match is perfect.
- Better Quality Score. Google rewards relevance with a lower cost per click and a better position. If you want to understand how that number comes about, read what Quality Score in Google Ads is.
- Clearer steering. Per ad group you see which theme performs and which does not, so you can adjust in a targeted way instead of guessing.
In practice, we see that a cleaned-up account structure feeds straight through into media costs. When Facilicom had its Google Ads Quality Score optimised, tighter grouping around themes was one of the levers behind the savings. Structure is therefore not a goal in itself, but a way to buy more relevant clicks per euro.
How do you build ad groups for B2B?
For a large webshop with lots of search volume, the advice is often: create many small, hyper-specific ad groups. For B2B that rarely works. Your search volumes are usually low, and if you spread them across dozens of mini groups, no single group collects enough data to steer on reliably or to let smart bidding strategies learn.
Our honest advice for B2B: go for a limited number of ad groups around clear themes that line up with your service pages. That way you keep enough volume per group while retaining thematic relevance. Then test whether splitting makes sense as volume grows.
Watch your campaign type as well. Some modern campaigns do not work with ad groups at all. Performance Max, for instance, uses asset groups instead of classic ad groups. So know which campaign type you are deploying before you sketch out the structure. Ad groups are a building block of broader PPC and SEA, so always align them with your bidding and budget logic at campaign level.
Common mistakes with ad groups
Most ad group problems are not exotic settings, but the same handful of basic mistakes we see again and again.
Too many keywords in one ad group
This is the classic. You cram ten diverging themes into one group and run a single ad on it. That ad cannot possibly be equally relevant for every keyword, so the Quality Score drops and your cost per click rises. The solution is not “split as much as possible”, but to bundle keywords that share the same intent and the same ad copy. If two keywords call for a different message, they belong in two groups.
Ads that do not match the keywords
A tight keyword list with a generic ad on top wastes the advantage of your structure. Take the group’s most important keyword literally into your headline. If someone searches for “accounting package construction” and reads “Accounting software for construction” in your headline, that feels like a direct answer. That is exactly what good ad relevance does for your Quality Score.
No negative keywords
Without negative keywords, a broad ad group also attracts irrelevant queries, for example people searching for “free” or “jobs”. Those clicks cost money and pollute your data. So look regularly at the search terms triggering your ads and exclude what does not fit.
A structure that does not match your site
An ad group around a theme for which you have no strong landing page will keep performing poorly, no matter how tightly you build it. Let your group breakdown follow your offering. Thorough keyword research helps you find those themes before you build the account, so every group has a logical destination.
Frequently asked questions
What is the difference between a campaign and an ad group? A campaign determines the budget, the bidding strategy and where your ads appear. An ad group sits within that campaign and bundles the keywords and ads around a specific theme. One campaign can contain multiple ad groups.
How many keywords should I put in an ad group? There is no fixed number, but keep the keywords thematically close together. For B2B with little volume, you are better off with fewer, coherent ad groups than with many small groups that collect too little data.
Does every campaign need ad groups? Classic search, display and video campaigns work with ad groups. Performance Max works with asset groups instead. So it depends on the campaign type you choose.
How do ad groups improve my Quality Score? By aligning keywords and ads tightly within a group, relevance goes up. Google rewards that relevance with a higher Quality Score, which lowers your cost per click and improves your position.
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