What is user authentication?

User authentication (also known as user authentication) is the process of identifying a user to ensure that the person or account accessing a system, application or online platform is actually who they claim to be. User authentication is an important security mechanism that ensures that unauthorized persons do not gain access to sensitive information or functions.

User authentication is usually performed by entering login information, such as user name and password, in a corresponding login page or app. The system then checks whether the information provided matches the data stored in its database. If the data matches, the user is considered authenticated and is granted access to the system.

There are various methods and technologies for user authentication, including

1. User name and password: This is the most common form of authentication, where the user enters a user name and a secret password.
2. Two-factor authentication (2FA): This is an advanced method that requires the user to enter a second factor in addition to their username and password, such as a one-time code sent to their cell phone.
3. Biometric authentication: This includes methods such as fingerprint recognition, facial recognition or iris scanning to verify the user's identity.
4. Single Sign-On (SSO): This allows users to log in to multiple applications or services with a single set of credentials.

User authentication plays a crucial role in the security of online services, especially in areas such as email accounts, social networks, banking and corporate systems. It protects user data and prevents unauthorized access and misuse of accounts.