analytics-dictionary / term / tracking & measurement

First-party data

First-party data is information you collect directly from your own customers and visitors.

Written by Reflective Data experts · updated Oct 5, 2026

It includes things like purchases, sign-ups, on-site behaviour and survey answers. Because you collect it yourself, with consent, it is more reliable and more durable than data bought from others.

As third-party cookies fade, strong first-party data collection, stored in your own warehouse, is becoming a core advantage.

Data warehouse Server-side tagging Third-party cookies

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