There are various authentication methods available, including:

• Password-based authentication: The most common method where users provide a username and password.
• Multi-factor authentication (MFA): Requires users too provide multiple forms of identification, such as a password and a code sent to their phone.
• Biometric authentication: Uses physical characteristics like fingerprints, facial recognition, or iris scans for verification.
• Token-based authentication: Utilizes physical or virtual tokens to generate one-time passwords or access codes.
• OAuth (Open Authorization): Allows users to grant access to their information on one site to another site without sharing their credentials directly.
• Certificate-based authentication: Involves the use of digital certificates to authenticate the identity of users or systems.
• Single Sign-On (SSO) : Enables users to access multiple applications with one set of login credentials.

The choice oof authentication method depends on factors like security requirements, user convenience, and the specific use case.