---
title: "What is an audience segment? | AdBuyMCP"
description: "A named group of people a seller will let you target, defined by some combination of demographics, behaviour, stated interest or inferred intent."
url: "https://adbuymcp.com/glossary/audience-segment"
---

[Home](https://adbuymcp.com/) / [Glossary](https://adbuymcp.com/glossary) / Audience segment

Targeting and identity

# What is an audience segment?

A named group of people a seller will let you target, defined by some combination of demographics, behaviour, stated interest or inferred intent, and identified in a buying system by a specific identifier.

Also called segment audience

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What it means here

## Here is what the term means for a UK buyer

The definition above holds anywhere. Buying media in the UK adds the detail below, including where AdBuyMCP does something different.

A segment is somebody's model of a group. 'IT decision makers' is a set of people a data vendor believes are IT decision makers, built from signals of varying quality. AdBuyMCP's design decision here is structural: the language model extracts semantics from your brief and never emits a vendor segment identifier. Deterministic registry tables do that, matching your terms against catalogue keywords by whole-token overlap. That is why a compiled plan can be audited line by line, and why a hallucinated segment cannot reach a buy.

Read next

- [The four channels in an awareness plan Channels](https://adbuymcp.com/channels)
- [What UK awareness advertising costs Cost](https://adbuymcp.com/cost)
- [How much of an audience survives each channel's targeting Guide](https://adbuymcp.com/guides/what-a-fidelity-score-is)

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Related terms

## These terms sit next to this one

Most confusion in media buying comes from two adjacent terms being used interchangeably, so these are the neighbours worth reading next.

- ### [Third-party data](https://adbuymcp.com/glossary#third-party-data)
  Audience data collected by one organisation and licensed to another for targeting, with no direct relationship between the licensee and the people described. Sold as segments through data marketplaces attached to buying platforms.
- ### [Fidelity score](https://adbuymcp.com/glossary/fidelity-score)
  A published score out of 100 answering one question: how much of an audience definition survives translation into a channel's native targeting words. It describes that translation, so it makes no forecast of reach or performance and says nothing about the quality of the media.
- ### [Contextual targeting](https://adbuymcp.com/glossary#contextual-targeting)
  Targeting based on the content an advert appears beside rather than on data about the person seeing it: a show, a genre, a page subject, a venue type. Requires no personal data about the audience.

Same group

## These terms are also in Targeting and identity

How an audience is described to a seller, and how much of the description survives. Most media-buying problems start at this translation step.

- [First-party data](https://adbuymcp.com/glossary/first-party-data)
- [Lookalike audience](https://adbuymcp.com/glossary#lookalike-audience)
- [Retargeting](https://adbuymcp.com/glossary#retargeting)
- [Frequency capping](https://adbuymcp.com/glossary/frequency-capping)
- [Deduplication](https://adbuymcp.com/glossary#deduplication)
- [Experian Mosaic](https://adbuymcp.com/glossary#experian-mosaic)
- [CACI Acorn](https://adbuymcp.com/glossary#caci-acorn)
- [Mobile advertising ID (MAID)](https://adbuymcp.com/glossary/maid)

[All 81 terms](https://adbuymcp.com/glossary)