What are ‘first-party’ and ‘third-party’ cookies?
Whether a cookie is ‘first’ or ‘third’ party refers to the website or domain placing the cookie.
First-party cookies are set directly by the website the user is visiting, ie the URL displayed in the browser's address bar.
Third-party cookies are set by a domain other than the one the user is visiting. This typically occurs when the website incorporates elements from other sites, such as images, social media plugins or advertising. When the browser or other software fetches these elements from the other sites, they can set cookies as well.