Web tracking cookies are small text files stored on your device by websites you visit. They help websites remember your preferences, login information, and browsing behavior. This information allows websites to provide a more personalized experience and improve their services. When you visit a site, cookies can track your activity across different pages and even other sites. This data is often used for targeted advertising, helping companies show you ads that match your interests. However, users can manage their cookie settings in their web browser to control how much tracking occurs.