What defines two-factor authentication?

• A. A method requiring a single password
• B. A security process where the user provides one authentication factor
• C. A security process in which the user provides two different authentication factors to verify themselves
• D. A security process that does not require any verification

Answer: (C)

Two-factor authentication (2FA) is defined as a security process in which the user provides two different authentication factors to verify their identity. This method enhances security by requiring users to present two forms of evidence before they gain access to an account or system. Typically, these factors fall into three categories: something you know (like a password), something you have (like a mobile device or token), and something you are (like a fingerprint or facial recognition).

By requiring two distinct factors, 2FA significantly mitigates the risk of unauthorized access, since an attacker would have to compromise both factors to gain entry. This layered approach provides additional protection against threats such as password theft, as knowing just one authentication factor is not enough for access.