authentication techniques

Authentication techniques are methods used to verify someone's identity before granting access to systems or information. Common methods include passwords or PINs, which are secret codes only the user should know. Biometric methods use unique physical traits, like fingerprints or facial recognition, to confirm identity. Two-factor authentication combines two methods—for example, a password plus a code sent to your phone—for added security. Other techniques include security questions or digital certificates. These methods help ensure that only authorized individuals can access sensitive data or systems, protecting privacy and preventing unauthorized use.