First-Party Cookie
A first-party cookie is a small file set by the website a user is directly visiting, used to remember things like login state, cart contents, and preferences. Because it belongs to the site itself, it is broadly supported and central to a normal user experience.
First-party cookies are set under the domain in the address bar and are generally not blocked the way third-party cookies are, since they serve the site's own functions.
As third-party cookies decline, first-party cookies and server-side approaches become the durable basis for analytics and recognition on your own properties.
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