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Definition
Strong authentication is a security approach that verifies identity using multiple or high assurance factors, such as biometrics, hardware security keys, or cryptographic certificates. It goes beyond basic passwords to provide higher confidence that the user is who they claim to be.

Why it matters
Strong authentication significantly reduces the risk of account takeover, phishing, and credential abuse. It is critical for protecting sensitive systems, personal data, and regulated environments where simple password based access is not sufficient.

Example use case
A user logs into a financial application using a password, confirms a push notification on a registered device, and completes authentication with a biometric scan.