Ad Group
An ad group is the mid-level container in a Google Ads campaign that groups related keywords and ads together, determining which ads serve for which queries.
An ad group is the mid-level organisational unit in a Google Ads campaign structure that holds a set of related keywords and the ads that serve for those keywords, sitting between the campaign level and the keyword level.
What Ad Group Means in Marketing
Google Ads uses a three-tier hierarchy: campaign, ad group, keyword (and ad). The campaign sets the overall direction: the budget, the bidding strategy, the campaign type and the broad targeting. The ad group refines within that: a specific theme, a specific set of keywords, and the ads that respond to them. Keywords and ads sit at the bottom.
The purpose of the ad group is relevance. When a user searches a query that matches a keyword in an ad group, Google serves an ad from that group. If the keywords in the group are tightly themed, the ad can be written specifically for that theme, and the landing page can match it closely. That alignment is what Quality Score rewards.
Ad groups are the primary unit where keyword-to-ad relevance is managed. Getting them right is central to campaign structure.
How Ad Group Works
When setting up a search campaign, the campaign-level settings define the type, bidding strategy and budget. Within that campaign, multiple ad groups can exist, each focused on a different keyword theme.
Each ad group contains:
- A set of keywords (with their match types and individual bids, if using manual bidding)
- One or more ads (typically Responsive Search Ads)
- Assets (sitelinks, callouts) can be set at the ad group level to override campaign-level assets for that theme
When a query triggers a keyword, Google uses the ad group’s ads to enter the auction. A tightly themed ad group produces higher Quality Scores because the keyword matches the ad matches the landing page.
The guiding principle for structuring ad groups is intent homogeneity: all keywords in a group should represent the same or very similar searcher need, so that a single well-written ad serves them all.
Ad Group Example
A digital camera retailer has a campaign for camera equipment. Within it, they have separate ad groups: one for “DSLR cameras” keywords, one for “mirrorless cameras” keywords, and one for “camera accessories” keywords. Each ad group has ads written specifically for its theme and links to the relevant category page. This structure ensures that a user searching for mirrorless cameras sees an ad about mirrorless cameras, not a generic camera ad.
Why Ad Group Matters for Marketers
Ad group structure is the architectural decision that determines Quality Score, cost per click and ad relevance for every keyword in the campaign. Tight, well-themed ad groups outperform loose, overcrowded ones even with the same keywords and budget, because they produce more relevant ads.
Frequently Asked Questions
How many keywords should be in an ad group?
The answer depends on how tightly you can group them by theme. A well-structured ad group contains keywords that all map to the same searcher intent and can be served by the same ad without any keyword feeling out of place. For most accounts, this means somewhere between five and twenty keywords per group. Tighter groups produce higher Quality Scores because the keyword, the ad and the landing page are all closely aligned. Cramming hundreds of loosely related keywords into a single group is a common mistake that lowers relevance across the board.
Should I put different match types in the same ad group?
Yes, generally. Keeping broad match, phrase match and exact match variants of the same keyword theme in the same ad group is standard practice. They will serve different queries but share the same ads and landing page. Some account structures use separate ad groups per match type to manage bids differently, but this adds complexity without always improving performance. The more important distinction is theme: keywords from different topics or intent levels should be in separate ad groups.
What is a single keyword ad group (SKAG)?
A single keyword ad group is a structure where each ad group contains only one keyword, typically in exact or phrase match. The argument is maximum relevance: the keyword, the ad and the landing page are perfectly aligned. In practice, Google's move toward broader automated bidding and Responsive Search Ads has reduced the advantage of SKAGs for most accounts. Modern best practice favours tightly themed ad groups over strict single-keyword structures, which adds management overhead without proportional performance benefit.
I run Google Ads accounts for brands in India and abroad. See how I manage search campaigns. Or see all my services.
Need help putting this concept into practice on your campaigns? Share your current targets and I will suggest the right approach.