Cookies are small text files stored on a user's device by a website to track activity, remember preferences, and enhance the browsing experience. They allow websites to keep users logged in, personalize content, and analyze visitor behavior.

A common use case for cookies is remembering login sessions and website settings. When users revisit a website, cookies help retain their preferences, such as language settings or shopping cart contents. However, some cookies, like tracking cookies, are used for targeted advertising and analytics, raising privacy concerns. Many browsers and privacy regulations, such as GDPR, now allow users to manage and restrict cookie usage.