Authentication is a process of verifying the identity of a user or entity before granting access to a resource or system. It ensures that the claimed identity is accurate and trustworthy by validating the provided credentials against a trusted source. Through authentication, organizations can establish trust and maintain the security of their systems and sensitive information.

Authentication typically involves the usage of unique identifiers, such as usernames or email addresses, along with secret information like passwords, PINs, biometric data, or cryptographic keys. These credentials are compared against pre-registered or stored credentials to validate the authenticity of the user. Advanced authentication methods also include multi-factor authentication, where multiple forms of identification are required, making it more challenging for unauthorized access. The process of authentication relies on various techniques like knowledge-based authentication, possession-based authentication, or inherence-based authentication to ensure the validity and integrity of the claimed identity.

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