Google uses CAPTCHA to ensure the safety and security of user information by preventing unauthorized access to accounts. CAPTCHA challenges are designed to verify that only human users with the correct password can gain entry, as computers lack the ability to read and interpret the distorted images or solve the problems presented in the tests.

You may see a CAPTCHA when you:

- Sign up for a new Google service (Gmail, Blogger, YouTube)
- Sign up for any edition of a Google Workspace Account
- Change a password on an existing account
- Setup Google services for a third party device or application (such as iPhone , Outlook, ActiveSync, etc.)

Hotmail CAPTCHA refers to the security measure used by Microsoft's email service, formerly known as Hotmail (now Outlook.com), to differentiate between human users and automated bots. By successfully completing the CAPTCHA, users prove that they are human, and this helps prevent automated bots from accessing or abusing Hotmail accounts for spamming or other malicious activities. The implementation of CAPTCHA enhances the overall security of the email service, protecting user accounts and maintaining a safe user experience for millions of Hotmail/Outlook.com users worldwide.