Third-party cookie
A cookie set by a domain other than the one in the address bar, used to follow people across sites.
A third-party cookie is set by an embedded resource from another domain, such as an ad server, and is sent back to that domain from every site that embeds it. That is what made cross-site ad tracking possible.
Safari and Firefox block third-party cookies by default. Chrome still allows them by default, after Google dropped its plan to remove them. Modern analytics and conversion tracking rely on first-party data and server events instead.
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