What causes the session to end after a brief period of inactivity?

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The session may end after a brief period of inactivity due to security measures implemented by the website or application. This is often done to protect user data and prevent unauthorized access. When a user is inactive for a certain amount of time, the website or application automatically logs them out to ensure that nobody else can access their account or data. This is commonly referred to as a session timeout. The length of the timeout may vary depending on the system and its security policy.