Third-Party Cookie is a cookie set by a domain other than the one a user is directly visiting.
Example of Third-Party Cookie
An embedded service can attempt to use a cookie from a domain different from the page the visitor opened. Browser restrictions and user settings may block that behavior, so a measurement plan should not assume third-party cookies are always available.
Why Third-Party Cookie matters
It matters because most visitors do not convert on the first visit. Retargeting terminology helps teams create thoughtful follow-up sequences, avoid wasted impressions, and respect audience exclusions and privacy expectations.
Related terms
- Cross-Device Tracking
- First-Party Cookie
- Sequential Messaging
- Cookie
- Audience Exclusion
- Conversion Pixel
Frequently Asked Question
What does Third-Party Cookie mean?
Third-Party Cookie means a cookie set by a domain other than the one a user is directly visiting.