The significance of multi-factor authentication (MFA) in security lies in its ability to enhance protection against unauthorized access. By requiring users to provide two or more verification factors—such as something they know (password), something they have (token), or something they are (biometrics)—MFA adds layers of security. This technique mitigates the risk of credential theft and reduces the likelihood of data breaches. As cyber threats evolve, MFA is essential for maintaining robust security protocols across systems, applications, and sensitive information.