Apps like Google Authenticator or Authy generate codes every 30 seconds, even without an internet connection.
Sent directly to your registered mobile number. Voice Call: An automated call reads the code to you. 6 digit verification code gmail
The 6-digit verification code is a critical security layer for Gmail, functioning as a "one-time password" (OTP) to prove your identity during login, account recovery, or sensitive setting changes. By requiring both something you know (your password) and something you have (the 6-digit code), Google prevents unauthorized access even if your password is stolen. How the Gmail 6-Digit Code Works Apps like Google Authenticator or Authy generate codes
Google uses these codes to verify your identity during high-risk scenarios, including: Turn on 2-Step Verification - Android - Google Account Help 6 digit verification code gmail