Two-Factor Authentication (2FA) is a security process that requires users to provide two different forms of identification before they can gain access to an account, system, or application. Typically, this involves the use of a combination of something the user knows (such as a password or PIN) and something the user has (such as a code sent to a mobile device, a security token, or a biometric verification like a fingerprint).
The goal of 2FA is to provide an additional layer of security beyond just a username and password, which can be compromised. By requiring multiple forms of authentication, 2FA helps to significantly reduce the risk of unauthorized access to sensitive information and systems.
It is widely used in various online services, banking, email accounts, and other systems that require heightened security. The introduction of 2FA has become increasingly important in countering security threats, identity theft, and unauthorized access attempts.