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What is a Third Party Cookie? Definition and Analytics Privacy Impact
A third-party cookie is a cookie set by a domain other than the website a visitor is currently using. If a visitor is on example.com and an advertising network sets a cookie from ad-network.com, that is a third-party cookie.
Third-party cookies are controversial because they can be used to track people across many websites, build advertising profiles, retarget visitors, and measure ad performance across domains.
Third-party cookie examples
Third-party cookies are commonly associated with:
- Advertising networks
- Retargeting pixels
- Cross-site analytics
- Social media widgets
- Embedded video platforms
- Affiliate tracking
- Data brokers
Not every third-party cookie is used maliciously, but the cross-site tracking capability is what created major privacy concerns.
First-party vs third-party cookies
| Cookie type | Set by | Common purpose |
|---|---|---|
| First-party cookie | The site being visited | Sessions, preferences, same-site analytics |
| Third-party cookie | Another domain | Cross-site tracking, ads, retargeting |
Browsers have increasingly restricted third-party cookies. Safari and Firefox block many of them by default, and Chrome has been moving away from broad third-party cookie support.
Third-party cookies and analytics
Analytics that relies on third-party cookies can face data loss, consent requirements, and trust problems. Privacy-friendly analytics avoids cross-site profiling and focuses on first-party, aggregate, or cookieless measurement.
Swetrix does not rely on third-party cookies. It gives teams website analytics, goals, events, funnels, performance monitoring, and error tracking without invasive cross-site tracking.
Related terms: cookie, first party cookie, cookie consent banner, and adblocker.
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