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Something you have (a trusted device that is not easily duplicated, like a phone).Something you know (typically a password).

Should the user lose the device, the person who finds it won’t be able to use it unless he or she also knows the user’s password. Even if an attacker manages to learn the user’s password, it is useless without also having possession of the trusted device. Compromising multiple authentication factors presents a significant challenge for attackers. The security of multi-factor authentication lies in its layered approach. It delivers strong authentication via a range of easy verification options – the phone call, text message, mobile app notification or verification code. The Multi-factor Authentication two-step verification is a method of authentication that requires more than one verification method and adds a critical second layer of security to user sign-ins and transactions. Azure Multi-factor Authentication helps safeguard access to data and applications while meeting user demand for a simple sign-in process.