What is the function of a cookie in web browsing?

A cookie's primary function in web browsing is to store user information for site recognition. When a user visits a website, cookies are created to retain certain data about the user's session. This may include login credentials, preferences, and other customizable elements that improve the user experience during subsequent visits. For instance, when a user returns to a site, cookies allow the site to recognize them and provide a more personalized interface, such as remembering their username or language preference.

This capability enhances the convenience and efficiency of web browsing by allowing users to avoid re-entering information repeatedly. Cookies can also facilitate the functionality of shopping carts by remembering what items have been added from previous visits, thus streamlining the online purchasing experience.

While other options mentioned, such as tracking online purchases or improving internet speed, may relate to the web experience, they do not encapsulate the primary role of cookies as effectively as storing user information does. Therefore, the correct answer reflects the essential function of cookies in establishing and maintaining user familiarity with websites.