Description: Session data refers to the data stored in a session, which is a period of interaction between a user and a web application. This data allows the application to remember information about the user across multiple requests, facilitating a more personalized and coherent experience. In the context of web applications in general, session data is essential for managing user authentication, preferences, and other states that need to persist during navigation. Session management is handled through middleware that allows for efficient storage and retrieval of session data, using different storage strategies such as memory, databases, or caching. This ensures that information remains available throughout the session duration, even as the user navigates between different pages of the application. The implementation of session data is crucial for applications that require user state tracking, such as online stores, social media platforms, and content management applications, where continuity and personalization are essential for user experience.