Two-factor authentication (2FA), also known as two-step verification or TFA, is a security process in which a user is required to provide two different authentication factors to verify their identity. This is done to increase the security of the user’s account and protect against unauthorized access.
The first factor is typically something the user knows, such as a password or PIN. The second factor is typically something the user has, such as a smartphone or a security token.
To use 2FA, a user must provide both factors when attempting to log in to an account. For example, the user might enter their password and then be prompted to enter a code that was sent to their phone via text message. Only after both factors have been successfully provided will the user be granted access to their account.
2FA can be used to protect a variety of accounts, including email accounts, social media accounts, and online banking accounts. It is an effective way to secure accounts against unauthorized access, as it requires attackers to have both the password and the second factor in order to gain access.