An encrypted database stores information in a form that cannot be read without the appropriate decryption key. Encryption may protect the entire database or selected fields, and its effectiveness depends on how keys are generated, stored, and accessed. Encryption at rest does not by itself protect data while it is being used by an authorized application.
In cyber security, encryption can limit the damage if attackers obtain database files, but access to usable keys or decrypted data may still expose sensitive information. In password-manager incidents, an exposed encrypted vault does not automatically mean its contents were readable or stolen in plaintext. Defenders should investigate what data was accessed, whether keys or recovery secrets were also exposed, and how the system handles decryption.