An ad group is an organizational unit inside a Google Ads campaign that holds one or more ads together with the targeting criteria that determine when they run. In practice, it is the middle level of the account hierarchy: above it sits the campaign, which sets objectives, budget and general settings, while below it sit the ads and the keywords or other targeting criteria. Each ad group shares a common theme, so that the ads shown are consistent with what users search for and with the linked landing pages.
The main function of the ad group is to connect ads, keywords and landing pages in a logical and relevant way. A well-organized structure lets you show the ad message that best fits each search intent, improve Quality Score and lower cost per click. For this reason, creating ad groups is considered one of the most delicate tasks in managing an advertising account.
When Google Ads shows the ads in an ad group
Within an ad group, Google Ads uses targeting criteria to decide when to show the ads. On the Search Network the main criteria are keywords, while on the Display Network they can be topics, interests, audiences or placements. When a user’s search matches one of the enabled criteria, the system evaluates the ad auction and, if the ad group is selected, shows one of the ads it contains.
Each ad group can contain multiple ads, even in different formats such as text ads, responsive ads or ads with extensions. Google Ads rotates the ads and favors the ones that perform better, optimizing the combination of creative and targeting criteria over time.
Difference between campaign and ad group
The campaign sets the economic and strategic framework: daily budget, bid strategy, distribution networks, run period and geographic and language settings. The ad group, on the other hand, operates within this framework and handles the thematic relevance between keywords, ads and landing page. In short, the campaign decides how much and where to spend, while the ad group decides who sees which message.
Role of keywords
Keywords are the link between the user’s search intent and the ad that is shown. In a well-built ad group, the keywords share a common meaning and the ads reflect their content. This consistency supports a higher Quality Score, which in turn can lower cost per click and improve ad position.
The most common ad group structures
There are several ways to organize ad groups, depending on objectives and industry. A common approach is one ad group per homogeneous theme, with a few closely related keywords. This choice, known as a granular structure, lets you tailor ads and landing pages more precisely.
An alternative is broader ad groups that group many keywords under a single theme. This structure is simpler to manage but can reduce ad relevance and make optimization less effective. The choice depends on the size of the account, the number of products or services and the resources available for management.
Ad groups on the Search Network
On the Search Network, ad groups are based mainly on keywords and on the match between those keywords and the ad text. It is good practice to include the main keyword in the ad headline and on the landing page, so as to signal the relevance of the message to Google and to the user.
Ad groups on the Display Network
On the Display Network, targeting does not depend on keywords but on criteria such as audiences, interests, topics and placements. In this context the ad group holds visual, text or responsive ads and associates them with user segments or specific sites, with the goal of reaching the audience that best fits the campaign.
Campaign, ad group and ad: the different levels of control
| Level | Main function | Elements contained | Typical settings |
|---|---|---|---|
| Campaign | Sets objectives, budget and strategy | Ad groups | Budget, bidding, networks, geographic area |
| Ad group | Organizes themes and targeting criteria | Ads and keywords | Ad group-level bidding, criteria |
| Ad | Communicates the message to the user | Headlines, descriptions, URL | Format, rotation, extensions |
| Keyword | Connects the search to the ad | Term and match type | Match type, bidding, status |
| Landing page | Welcomes the user after the click | Content and conversion forms | Final URL, relevance, speed |
Best practices for creating effective ad groups
Good ad group design directly affects campaign performance. Below are the main operational recommendations.
- Group keywords by homogeneous theme, avoiding mixing different search intents in the same group.
- Keep a limited number of keywords per group, so as to preserve ad relevance.
- Write at least two or three ads per group, with headline and description variants to test.
- Include the main keyword in the ad headline and on the landing page.
- Link each group to a specific landing page that is consistent with the ad message.
- Use ad extensions to add useful information such as address, phone number and sitelinks.
- Monitor performance and move keywords with poor results into more relevant groups.
- Avoid excessive overlap between groups, which can create internal competition and raise costs.
Frequently asked questions about ad groups
What is an ad group in Google Ads?
It is a unit inside a campaign that holds ads and targeting criteria under a common theme, determining when and to whom the advertising is shown.
How many ads should an ad group contain?
There is no mandatory number, but it is advisable to include at least two or three so you can test variants and identify the one with the best performance.
What is the difference between a campaign and an ad group?
The campaign sets budget, bidding and distribution networks, while the ad group organizes ads and targeting criteria by theme.
Can I use the same keywords in different groups?
It is possible but not recommended, because the overlap creates internal competition and can raise cost per click.
How do you choose the ad group structure?
It depends on objectives, industry and the number of products or services; a granular structure offers more control, while a broader one simplifies management.
Do ad groups work on the Display Network too?
Yes, but in this case targeting is based on audiences, interests, topics and placements rather than keywords.
Ad groups to fix?Are your Google Ads ad groups so generic that the ads shown don’t really speak to what people are searching for?Groups that are too broad waste budget and lower Quality Score, making you pay more for less relevant clicks. I restructure them with targeted keywords and specific ads for each theme, so every search finds the right message.Discover Google Ads Management