CAPTCHA definition in Cybersecurity

CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a type of challenge-response test used in computing to determine whether the user is human. CAPTCHAs help protect websites from spam and abuse by preventing automated bots from performing unauthorized actions.

Open source or Free solutions

1. reCAPTCHA
2. hCaptcha

Paying solutions

1. Akismet
2. CleanTalk