Session management involves creating and maintaining user sessions throughout their interaction with a web application. Sessions enable applications to store and retrieve user-specific data, such as authentication status, preferences, and shopping carts. ExpressJS facilitates session management through middleware and libraries, allowing developers to handle sessions seamlessly.

Key Concepts and Components:

• Session Data: Session data holds user-specific information and is stored on the server. It typically includes user IDs, authentication status, and custom data.
• Session ID: A unique identifier assigned to each user's session. It's used to associate session data with the correct user.
• Cookies: Cookies are small pieces of data stored on the user's browser and contain the session ID. They help maintain session state between requests.
• Middleware: ExpressJS middleware, such as `express-session`, is used to manage session data and handle session-related operations.

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