Reauthentication is a security process in which a user is required to re-enter their login credentials, such as a password or biometric data, to verify their identity. This typically occurs after a certain period of inactivity, when performing sensitive actions, or when accessing restricted resources. The purpose of reauthentication is to ensure that the person interacting with the system is still the authorized user, thereby reducing the risk of unauthorized access due to session hijacking or unattended devices. It is a common feature in banking, enterprise, and cloud applications to enhance security.