Google uses Captcha for its accounts in order to prevent any unauthorized entry into an account. This is the code or set of characters you enter during your registration process. This helps your account to get locked if someone repeatedly attempts to enter your account. To retrieve your account, you then have to unlock Captcha Gmail through simple steps. First navigate into the ‘unlock Gmail Captcha’ page and type in your Gmail username and Gmail password and key in the Captcha characters you find and click on ‘unlock’. Your account would now be unlocked for you to freely access. Google advices its users to periodically reset this code to avoid unwanted take over of accounts.