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Definition
MFA, or multi factor authentication, is a security approach that requires users to verify their identity using two or more authentication factors. These factors can include something the user knows, has, or is.

Why it matters
MFA greatly reduces the risk of unauthorized access by adding layers of verification beyond a single password. It protects accounts even if one factor, such as a password, is compromised.

Example use case
A user signs into a business application with a password, confirms a push notification on their phone, and completes login with a biometric check.