Google Ads Audience Segments: Affinity, In-Market, Life Events and Demographics

Everything below comes from Google Ads Help: About audience segments, About "Targeting" and "Observation" settings, About demographic targeting, About custom segments, About audience signals for Performance Max campaigns, Add audience targeting to an ad group or campaign and Updates to Audience terms and phrases. Lists of your own visitors and customers are covered in our guides to remarketing audiences and Customer Match, so this page only touches them.

What an audience segment is

Google defines audiences as segments, groups of people with specific interests, intents, and demographic information, as estimated by Google. You add segments to a campaign or ad group, and Google Ads will show ads to people who are likely in the selected categories. The word "estimated" matters: Google builds segments from people's activity on Google products and on third-party websites, or from the kind of content certain groups tend to be interested in. Nobody fills in a form saying they are a "cycling enthusiast".

If you have read older guides, the names have changed. Google now calls audience types "audience segments", and remarketing is now "your data". Affinity, in-market, life event and detailed demographic audiences all became segments, and custom audiences became custom segments.

The segment types Google offers

Google's own one-line descriptions, with what each one means in practice:

• Affinity segments: Reach users based on what they're passionate about and their habits and interests. These are long-term interests such as sports fans or green living enthusiasts. They suit awareness: you reach people who care about a subject, not necessarily people about to buy.
• In-market segments: Reach users based on their recent purchase intent. Google says they are designed for advertisers focused on getting conversions from likely buyers and reach people who are researching products and actively considering buying something like yours.
• Life events: Reach users when they're in the midst of important life milestones, such as graduating, moving home or getting married. Google notes that life events are infrequent, so they may reach fewer people than affinities, but the segment is often larger than an in-market one, because a single event such as a move leads to many purchases (furniture, movers, a mortgage).
• Detailed demographics: Reach users based on long-term life facts, such as college students, homeowners or new parents. These go beyond the basic age and gender settings covered below.
• Custom segments: segments you define yourself with keywords, URLs and apps (more on these below).
• Your data segments: people who have interacted with your business: website and app visitors, Customer Match lists from your CRM, and Google-engaged audiences (people who interacted with your site on Google Search, YouTube or other Google sites). Lookalike segments, built from a "seed" list, are only available in Demand Gen campaigns.

Google publishes the full list of affinity, in-market and detailed demographic categories as downloadable CSV files on the audience segments page, which is the quickest way to see whether a segment exists for your trade. It also states that it doesn't use sensitive information like health, race, religion, or sexual orientation to tailor ads to users.

Which campaign types allow which segments

Not every campaign type takes every segment. This is Google's compatibility table:

Performance Max is missing from the table on purpose. It has no audience targeting in the usual sense; you add audience signals instead, which work differently (see below).

Targeting or Observation

When you add a segment you choose one of two settings, and this choice matters more than which segment you pick.

• Targeting narrows the campaign or ad group: ads show only to people in the selected segments. Google's own words: Targeting restricts the reach of your ad group. Google recommends Targeting for all advertisers in their Display campaigns. In a Display campaign with no targeting at all, your ads can run anywhere on the Display Network and YouTube within your location, language and exclusion settings.
• Observation leaves reach unchanged. Google says the setting won’t change who can see your ads or where they can show, but it lets you see how the ads perform for people in the segment, and set bid adjustments for them. Google recommends Observation for all Search campaigns as well as for the Display campaigns of more advanced advertisers.

Google's example: a shop selling women's motorcycle jackets targets the "Female" gender and the "Motorcycle Enthusiasts" affinity segment, so its ads only reach women interested in motorcycles. It then adds the in-market segment for activewear as Observation, to learn whether those people respond differently, without shrinking reach. If they do, it can raise or lower bids for them or build a separate ad group with its own landing page.

Three details from Google's page are easy to miss. Observation data only covers people who also match your existing targeting. For campaigns on Smart Bidding, first-party segments added under Observation will be used as signals for Smart Bidding strategies. And you cannot add an Observation method when you first create an ad group; you add it afterwards. In Search and Shopping campaigns Google lists Observation as the recommended usage.

For a small business running Search ads, this points to a simple starting habit: add a few relevant in-market and your-data segments under Observation, let them collect data, and only switch one to Targeting (or adjust bids) when the numbers clearly differ. Targeting on Search cuts you off from people who searched your keywords but are not in the segment.

Demographic targeting

Demographic targeting reaches people likely to be within a particular age range, gender, parental status, or household income. Google's example is a fitness studio for women that does not want to show ads to men. The options are the same across Demand Gen, Display, Performance Max, Search and Video campaigns, except that Google's list for Search does not include parental status:

• Age: 18-24, 25-34, 35-44, 45-54, 55-64, 65+ and Unknown.
• Gender: Female, Male and Unknown.
• Parental status: Parent, Not a parent and Unknown.
• Household income: Top 10%, 11-20%, 21-30%, 31-40%, 41-50%, Lower 50% and Unknown, only in the countries Google lists (the United States, Canada, Australia, Japan and a set of others).

The Unknown category is the one to be careful with. Google says it covers people whose demographics it has not identified, and that some Display Network sites opt out of demographic targeting. Unknown is selected by default when you target by demographics, and Google advises excluding it only if you're sure you want to restrict your campaign to a narrow audience.

Google determines demographics from signed-in users' account settings (which people can edit in My Ads Center), from some sites that share what people tell them, and by estimating from activity on Google properties and the Display Network. Advertisers cannot target ads only to children under 13 or only to teens under 18. Besides targeting, you can exclude a demographic group or keep showing ads to everyone and bid higher or lower for one group.

Custom segments

When no ready-made segment fits, a custom segment lets you describe the audience yourself. Google's example is a running shoe company that wants "avid marathon runners" rather than the broad Sports Fans affinity. You can enter three kinds of input:

• Keywords for interests or behaviors. By default Google reads them as People with any of these interests or purchase intentions. The alternative, People who searched for any of these terms on Google, only works on campaigns running on Google properties such as Google.com and YouTube; on other campaigns the terms are treated as interests again.
• URLs of sites your ideal customer might visit. Your ads reach people who browse similar sites. Google notes this doesn't mean your ads will show on those URLs.
• Apps your ideal customer might use, with the same caveat: ads reach people who use similar apps, not those apps' screens.

Google's custom segments page lists Display, Gmail, Demand Gen and Video campaigns. Based on your campaign goals and bidding, the system leans the segment towards reach, consideration or performance. Custom segments are created in Audience manager under Tools, are reviewed against advertising policies, and cannot be shared from one account to another. You also cannot apply them directly to Performance Max; you use them there as audience signals.

Audience signals in Performance Max

In Performance Max you attach an audience to each asset group as a signal, a hint for Google's models rather than a limit. Google is direct about it: Performance Max may show ads to relevant audiences outside of your signals if they have a strong likelihood of converting. Adding signals is optional.

To add one, open the Audiences section under the asset group, choose Select an Audience or Create an Audience, name it, add your data and custom segments, and save. Google's suggested inputs are your data (website visitors, app users, customer lists, video viewers), custom segments, demographics, and the affinity, in-market, life event and detailed demographic segments described above. Its own tip: To enhance machine learning, use search term based custom segments. Our Performance Max guide covers how asset groups and signals fit together, so we will not repeat it here.

Adding segments to a campaign

Google's steps for an ad group or campaign:

1. In your Google Ads account, open Campaigns, then Audiences, keywords, and content, then Audiences.
2. In the Audience segments module, click Edit audience segments.
3. Choose the campaign and ad group you want to change.
4. Pick Targeting or Observation, then tick the segments you want.
5. Click Save.

The picker has a search box that finds segments across all categories, plus audience ideas, suggestions Google bases on your selections, your website, your Search campaigns and similar advertisers. The same Audiences page reports performance by segment, demographics and exclusions. Remember that Google refreshes audience data weekly, so segment sizes and reports can move a little from week to week.

Limits to keep in mind

• Personalization is not always allowed. Google says privacy and policy restrictions, turned-off ads personalization and under-18 policies mean some people in a segment cannot be shown personalized ads, even if they belong to it.
• Consent in Europe. Under Google's EU user consent policy you must obtain valid consent where the law requires it, and pass that consent to Google. See our cookie consent guide.
• Segments are estimates. Some people will be in a segment who should not be, and many who should be are not. Watching results under Observation before narrowing reach protects you from that.
• Higher bids elsewhere still win. If two of your campaigns compete for the same person, Google says the auction picks the one with the highest effective bid, regardless of which has the audience adjustment.
• Measure the outcome. A segment that "looks right" is not proof. Without conversion tracking you cannot tell whether it brings customers or only clicks.

Frequently asked questions

What are audience segments in Google Ads?

Groups of people with specific interests, intents or demographic traits, as estimated by Google. You add them to campaigns or ad groups to reach those people or to watch how they perform. Google's main types are affinity, in-market, life events, detailed demographics, custom segments and your data segments.

What is the difference between affinity and in-market segments?

Affinity segments describe lasting interests and habits, such as sports fans. In-market segments describe recent purchase intent: people researching and actively considering a product or service like yours. Google says in-market segments are designed for advertisers focused on conversions from likely buyers.

Should I use Targeting or Observation?

Google recommends Observation for all Search campaigns and Targeting for Display campaigns. Observation leaves reach unchanged and shows how a segment performs. Targeting limits ads to people in the segment.

Can I use audience segments in Search campaigns?

Yes. Google's table lists affinity, in-market, detailed demographics and your data for Search. Custom segments and life events are not available there. Google recommends adding them under Observation.

Do Performance Max campaigns use audience targeting?

No. Performance Max uses audience signals, which guide Google's models but do not limit who sees the ads. Google says it may show ads outside your signals to people likely to convert.

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