Usernames and passwords - Users provide personal credentials to verify their identity., Biometrics - Verifies identity based on unique biological characteristics like fingerprints, facial features, iris patterns, or voiceprints., CAPTCHA - Users must complete a challenge, like typing distorted text or choosing pictures, as well as providing a username and password. This proves they are human and not automated bots., Single Sign-On (SSO) - Users authenticate once and gain access to multiple systems or services without needing to log in again., Smart Card - A small plastic card with an embedded chip used for tasks like making payments, accessing buildings, or storing important information securely., Two-factor/Multi-factor Authentication - Requires users to provide multiple authentication factors for access, such as passwords, biometrics, tokens, or SMS codes.,

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