Measurement glossary

What Is First-Party Data?

Definition

First-party data is information a business collects directly through its own customer and prospect relationships.

How First-Party Data Works

Examples include transactions, CRM records, website events, email engagement, call outcomes and customer preferences collected with appropriate notice and consent.

A Simple Example

A company can use its list of past purchasers to measure new-customer share or create an audience for suppression or modeling.

Why First-Party Data Matters

First-party data connects media platforms to real business outcomes and becomes more valuable as third-party identifiers weaken.

Common Misreading

Owning the collection point does not remove privacy, security or consent obligations. Data quality and lawful use still matter.