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 ...

If you’ve ever applied for a credit card or completed a job application, you’ve probably been asked for your Social Security ...

, 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.