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Marketing Glossary· Lookalike

What is a Lookalike Audience?

By Nikhil Sharma · Updated 1 November 2026 · Marketing Glossary
Definition

Lookalike Audience is a new audience an ad platform builds to resemble your existing customers — it analyses a source list (your best customers) and finds other people who share their traits.

What is a lookalike audience?

You give a platform a ‘seed’ audience — say your highest-value customers or converters — and it finds new people who look similar across the signals it holds. It’s a way to scale prospecting beyond people who already know you, grounded in who actually buys.

How it works

Upload or define a source audience (ideally built from first-party data like customers or high-LTV buyers), and the platform models the shared characteristics, then builds a larger audience resembling them. Quality of the seed decides quality of the lookalike — garbage in, garbage out.

How to use it

Seed with your best customers, not all leads, so you prospect toward high value. Lookalikes pair well with retargeting (new reach + warm follow-up) and with strong creative. As third-party signals shrink, first-party-seeded lookalikes become more important.

Related terms
RetargetingProgrammatic AdvertisingFirst-Party DataICPLTV
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Written & reviewed by Nikhil Sharma
Founder, Fabulous Media
Nikhil has led growth for 850+ brands across 35 nations since 2008. Fabulous Media is an invitation-only growth agency that reports on pipeline and revenue, not vanity metrics. Meet the team · Request an invite.

Questions, answered

A new audience an ad platform builds to resemble your existing customers. You provide a source list of your best customers, and the platform finds other people who share their characteristics, letting you scale prospecting toward likely buyers.

Seed it with your best customers — high-value or high-converting ones built from first-party data — not just any leads. The platform models that seed, so its quality determines the lookalike's quality: better seed, better audience.

Yes, and arguably more important as third-party tracking shrinks. Lookalikes seeded from strong first-party data let platforms find similar high-value prospects, and they pair well with retargeting and good creative.

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