The SameSite cookie attribute is a security measure that helps protect user privacy by controlling when cookies are sent in cross-site requests. Cookies are small data pieces that web browsers save on user devices, helping websites remember things about users. The SameSite attribute can be set to Strict, Lax, or None, with each setting offering varying levels of control over cookie usage. Setting the attribute to Strict ensures high security, while Lax strikes a balance between usability and security. Using SameSite=None requires marking the cookie as Secure, and is often used for cross-site tracking or Single Sign-On systems. Developers can choose the right configuration based on their specific use case to ensure a better user experience while maintaining web security.