An extra layer of security
Most people only have one layer – their password – to protect their account. With 2-Step Verification, if a bad guy hacks through your password layer, he'll still need your phone or Security Key to get into your account.
Sign in will require something you know and something you have
With 2-Step Verification, you'll protect your account with something you know (your password) and something you have (your phone or Security Key).
Verification codes made just for you
Codes are uniquely crafted for your account when you need them. If you choose to use verification codes, they will be sent to your phone via text, voice call, or Google's mobile app. Each code can only be used once.