Authentication services verify the identity of a user, device, or application before granting access to a system or resource. Authentication ensures that only legitimate users can access the system.
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Types of Authentications:

Password-Based Authentication

The most common method, where users enter a password to verify their identity. However, passwords can be vulnerable to attacks if not managed properly.

Multi-Factor Authentication (MFA)

Requires two or more verification methods, such as something the user knows (password), something the user has (smartphone), or something the user is (biometrics).

Biometric Authentication

Uses unique biological traits such as fingerprints, facial recognition, or iris scans to verify identity.

Token-Based Authentication

Involves using a token, which can be a physical device (e.g., smart card) or a software token (e.g., OTP generated by an app).

Single Sign-On (SSO)

Allows users to log in once and gain access to multiple applications without needing to reauthenticate. SSO is commonly used to enhance user convenience and reduce password fatigue.

Examples

Google Authenticator, Okta, Microsoft Azure Active Directory, and RSA SecurID.