An authenticator is a tool or application used to verify a person's identity, especially in digital environments. It generates unique codes that are time-sensitive, adding an extra layer of security to online accounts. This process is often part of two-factor authentication (2FA), which requires both a password and a code from the authenticator. Common examples of authenticators include mobile apps like Google Authenticator and Authy. These apps create a new code every 30 seconds, making it difficult for unauthorized users to access accounts. By using an authenticator, individuals can better protect their sensitive information from cyber threats.