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A session in web development refers to the period of interaction between a user and a web application or website, starting from the moment the user logs in or visits the site until they log out or leave. It's a way for the server to keep track of user-specific information across multiple requests or page views.

Sessions are essential for maintaining stateful communication between the client (typically a web browser) and the server. They allow the server to store user data temporarily, such as login credentials, preferences, shopping cart contents, and other personalized information.

Sessions are typically implemented using a unique session identifier (session ID), which is generated by the server and stored on the client side, usually as a cookie. This session ID is sent with each subsequent request to the server, allowing the server to retrieve the corresponding session data and maintain continuity of the user's session.

Developers may use sessions for various purposes, including:

  • User authentication. Storing information about the user's login status and permissions.
  • Personalization. Customizing the user experience based on preferences or previous interactions.
  • Shopping carts. Keeping track of items selected by the user for purchase.
  • Form data. Preserving data entered by the user across multiple pages or steps.

Sessions play an important role in building dynamic and interactive web applications, enabling them to deliver personalized experiences and retain user-specific data throughout the user's visit.

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