This means that you enabled 2-Step Verification. You should get a text on your mobile phone, a call on your landline, or you can use the Google Authenticator App on your smartphone. read more
Passwords and codes used with 2-Step Verification There are several differences between traditional passwords, like the one you use to sign in to your Google Account, and the verification codes and App passwords you for 2-Step Verification. read more
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 our mobile app. Each code can only be used once. read more