Account Expiration: "Account expiration" refers to a security and administrative feature in computer systems and networks, where a user's account is set to become inactive or unusable after a specified period or at a predetermined date. This feature is commonly used in various contexts, such as corporate environments, educational institutions, or online services, to manage access and maintain security. Account expiration is particularly important for temporary or short-term users like contractors, interns, or guests, ensuring that access to resources is automatically revoked when it is no longer needed or when a user's relationship with the organization ends. It's also used as a precautionary measure to prevent dormant accounts from becoming security vulnerabilities. Administrators can set expiration dates manually or configure policies for automatic expiration. Once an account expires, the user cannot access the system or network resources until the account is renewed or reactivated by an administrator, if policy allows. This practice helps in maintaining the hygiene of the user database and reducing the risk of unauthorized access.