Audience Targeting

Topics Targeting vs In-Market Audiences: Page or Person

In short: Both scope Display and YouTube delivery to a subject, but they aim at different objects: in-market follows the person wherever they browse, while topics targets the content itself and accepts whoever happens to be reading it. That produces opposite mismatches - in-market shows relevant ads on irrelevant pages, topics shows ads on relevant pages to possibly indifferent people. It also splits on privacy mechanics, since topics needs nothing about the user at all. Buy the person when purchase intent is what matters; buy the page when context and adjacency are what matter.

By the AdFlint research team · Fact-checked against current Google and Meta platform behavior · Last reviewed July 2026

In-Market Audiences

Targets people Google has identified as actively researching or comparing products in a defined category, based on their recent search and browsing behavior.

You attach an in-market segment to a Display, Video, Demand Gen, or Search ad group and Google matches users whose recent activity signals active purchase research. Reach for it when you want intent-led reach beyond your own keyword footprint. The common mistake is applying it to Search as targeting rather than observation, which narrows an already intent-qualified audience for no gain.

Full definition

Topics Targeting

Places Display or video ads on pages and channels about a chosen subject, targeting the content being consumed rather than the person consuming it.

You pick from Google's topic tree and your ads become eligible on any inventory Google classifies under that topic, at whatever depth you select. It is a fast way to get broad contextual coverage across the Display Network or YouTube. Because topics are wide by design, they pull in far more inventory than expected, so placement exclusions and a capped budget keep the waste visible.

Full definition

Side by side.

The differences that actually change what happens in your account.

	In-Market Audiences	Topics Targeting
What gets matched	The user's recent shopping behavior, wherever they show up.	The page, channel, or app's subject classification, whoever is on it.
Where ads appear	Any eligible inventory the person visits, including sites unrelated to your category.	Only content classified under the topic you picked.
Who sees them	Category shoppers, on-topic page or not.	Anyone consuming the content - shopper, hobbyist, or student.
Brand adjacency control	Weak - the ad follows the person onto whatever inventory they browse.	Strong - the surrounding content is on-topic by construction.
Precision lever	Category choice only - the taxonomy sets the grain.	Tree depth - a broad node buys the whole subject, a deep node narrows it sharply.
Dependence on user identity	Needs Google to recognize the user's behavior history.	None - pure contextual matching that works for signed-out users.
What cleanup looks like	Scrubbing junk placements the shopper was followed onto.	Excluding stray subtopics and placements the wide tree pulled in.

What actually separates them.

Topics can serve to someone with zero interest in your product while in-market can serve on a page with zero relevance to it - opposite mismatch shapes that call for different creative.

Combining a topic and an audience segment in one ad group intersects them - person and page must both match - unlike two audience segments, which union.

Topics is contextual and needs no user identity, so it keeps working where consent, sign-in status, or tracking limits thin out person-based signals.

Your precision lever differs: topic tree depth is adjustable while in-market category grain is fixed, so only topics lets you trade reach for tightness continuously.

A topics campaign's placement report doubles as a discovery tool - winning sites and channels can be promoted into managed placements - while in-market placements are scattered wherever shoppers happened to browse.

Which one should you use?

Use In-Market Audiences when

You are running direct response and the person's purchase intent matters more than the page they are on.
Your buyers consume all kinds of media, so content adjacency would miss most of them.
You want the same shopper reached across the different sites in their day, not only on category pages.
You want an intent signal that can also layer onto Search as observation.

Use Topics Targeting when

Brand or legal requirements demand your ads sit next to relevant, predictable content.
You want delivery that does not depend on user-level data or identity signals at all.
You want a sponsorship-like presence across an entire content vertical on Display or YouTube.
Your product's relevance is obvious in context, so on-topic pages do half the creative's work.
You are prospecting for placements - running a topic wide, then mining the placement report for winners.

Common questions.

Should I layer a topic on top of my in-market segment?

Only deliberately, because content and audience targeting in the same ad group intersect - the shopper must be on an on-topic page for the ad to serve. That combination can be very tight and very low-volume. Use it when adjacency is mandatory; otherwise run them separately and let each do its own job at full reach.

Why is my topics campaign showing on so many irrelevant sites?

Topic nodes are wide by design, and a broad node includes every subtopic beneath it plus every page Google classifies under any of them. Pick deeper nodes in the tree, add placement and subtopic exclusions as the placement report fills in, and keep a capped budget while you prune. Expect classification to be imperfect at the edges even after cleanup.

Which of these holds up better as tracking gets restricted?

Topics, structurally. It matches on the content, not the user, so it needs no cookies, no sign-in, and no behavioral history. In-market depends on Google recognizing enough of the user's behavior to classify them as a shopper, which is robust on Google's own surfaces but still user-based. Contextual is the fallback that cannot be turned off by privacy settings.

Do topics work on YouTube or just websites?

They work on YouTube as well - channels and videos are classified into the same topic tree, so a topic buy makes you eligible across matching video inventory. The same caveats apply: classification is broad, so review the placement report and exclude channels that match the topic technically but not your buyer.

Or stop choosing between them.

AdFlint picks the setting, writes the ads, and keeps optimizing inside the Google and Meta accounts you already own.

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