First and Third-Party Cookies
Whether a cookie is first-party or third-party refers to the domain placing the cookie. First-party cookies are those set by a website that is being visited by the user, the website displayed in the URL window e.g. granularit.com. Third-Party cookies are cookies that are set by a domain other than that of the website being visited by the user. If a user visits a website and another entity sets a cookie through that website this would be a third-party cookie.