ReCAPTCHA is a security tool designed to protect websites from spam and automated abuse. It helps verify that a user is a real person and not a bot by presenting challenges, such as identifying objects in images or solving simple puzzles. This ensures that only legitimate users can access certain features or submit forms. Developed by Google, ReCAPTCHA has evolved from simple text recognition tasks to more advanced methods that analyze user behavior. It aims to enhance online security while minimizing inconvenience for genuine users, making it easier for them to navigate websites without unnecessary hurdles.