Two-factor authentication (2FA) is a security process that requires users to provide two different types of identification before gaining access to an account or system. Typically, this involves something you know (like a password) and something you have (such as a code sent to your phone) or something you are (like a fingerprint). By requiring two separate forms of verification, 2FA significantly reduces the risk of unauthorized access, even if one factor, like your password, is compromised. This added layer of protection is widely used to secure online accounts, financial services, and sensitive data.