Add Yahoo as a preferred source to see more of our stories on Google. What's a verification code, and why are they so important? Six-digit verification codes are a form of two-factor authentication, a ...

To help keep your MLB account more secure, MLB is adding multi-factor authentication (MFA). When you sign in, you’ll use your email and password, then confirm it’s you with a 6-digit verification code ...

, a process that helps keep your important online accounts secure. For example, you might get a text message or email with a six-digit code that you must enter when you log into your bank account.