This method enhances security by combining something you know (like a password) with something you have (like a mobile device) or something you are (like a fingerprint). When logging in, users first enter their password, then receive a code via SMS, email, or an authentication app that they must enter to complete the login process. This extra step makes it significantly more difficult for unauthorized users to gain access, even if they have stolen the password.
Two Factor Authentication Example
For example, when you log into your online banking account, you enter your password and then receive a text message with a code that you must enter to complete the login.