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 ...

Six-digit verification codes are a form of two-factor authentication, a process that helps keep your important online accounts secure. For example, you might get a text message or email with a ...

I don't see the six-digit code as a security primitive with a marketing problem but as the opening line of a conversation.