A third-party cookie is a type of cookie that is placed on a user's device by a third-party website or advertiser, rather than by the website that the user is currently visiting. Third-party cookies are typically used to track and collect data on the browsing behavior of users across multiple websites, and to enable targeted advertising based on this data. For example, if a user visits a website that has third-party cookies enabled, the third-party advertiser may place a cookie on the user's device that can then be used to track the user's behavior as they visit other websites, and to serve them targeted ads based on their interests and preferences. Third-party cookies have been a controversial topic, due to concerns about privacy and the potential for users to be tracked and targeted without their knowledge or consent. Some web browsers now offer users the option to block third-party cookies, in order to protect their privacy and control the data that is collected about them.