CAPTCHA, short for “Completely Automated Public Turing test to tell Computers and Humans Apart,” serves as a crucial defense against unwanted online activities. This human verification method aims to protect websites and online services from spam, unauthorized access, and malicious bots. By presenting users with puzzles, distorted characters, or image recognition tasks, CAPTCHA effectively separates real individuals from automated systems. Not only does it bolster online security, but CAPTCHA also ensures a fair and trustworthy user experience. From preventing fake account registrations to thwarting email spam, the implementation of CAPTCHA proves instrumental in securing online interactions.#32#