CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a security measure used to verify that a user is human and not a bot. CAPTCHA typically presents a challenge, such as identifying distorted text, selecting images with specific objects, or solving simple puzzles. These challenges are designed to be easy for humans but difficult for automated bots to solve, preventing spam and malicious activities on websites.
CAPTCHA is widely used on login pages, contact forms, and e-commerce sites to prevent fraudulent activity and ensure that interactions are legitimate. With the rise of sophisticated bots, CAPTCHA technology continues to evolve, incorporating more advanced methods like invisible reCAPTCHA and biometric verification to stay ahead of malicious actors.