Authentication is the process of verifying the identity of a user, device or system.
Authentication is used to ensure that only authorized entities are granted access to resources or information. This is done to secure systems and protect sensitive information from unauthorized access. There are several types of authentication methods including passwords, biometrics, security tokens, smart cards, and certificates. The most common method of authentication is the use of a password, which is a string of characters that is known only to the user. Biometric authentication uses physical characteristics such as fingerprints, iris scans, or facial recognition to verify a user’s identity. Security tokens and smart cards provide an additional layer of security, as they are only accessible to the user with the correct token or card. Finally, certificates provide a secure and encrypted connection for online transactions and communications.