Session Data refers to the information collected during a user's interaction with a website or application. This data typically includes details such as user preferences, login status, and activity history. It helps improve user experience by allowing the system to remember users and their actions across different pages or sessions. Session Data is often stored temporarily on the server or in the user's browser using cookies. This information is usually deleted after a session ends, ensuring privacy and security. By managing session data effectively, developers can create more personalized and efficient digital experiences for users.