A supercookie is a type of tracking cookie that is designed to collect and store a vast amount of user data, often without their knowledge or consent. Unlike traditional cookies, which can be easily deleted, supercookies are persistent and can track a user’s online activities across multiple websites and devices. This allows companies to create detailed profiles of individuals and target them with personalized advertisements. Supercookies are often used by advertisers and data brokers to gather valuable information about consumers, making them a major privacy concern in the digital age.