Multi-factor authentication (MFA) is one of the simplest and most effective ways to protect your business. But it’s also one of the most misunderstood. Most people know they “should have it,” but don’t fully understand what it does—or why it matters. What Is MFA? MFA stands for multi-factor authentication. It means you need more than just a password to log in. Instead of only entering a password, you also need something else, such as: A code from an authenticator app (TOTP) A push notification on your phone A text message with a verification code A physical security key (yubikey or smartcard)...