A CAPTCHA code is a security test used on websites to determine whether the user is a human or a computer bot. CAPTCHA stands for "Completely Automated Public Turing test to tell Computers and Humans Apart." It typically involves challenges such as recognizing distorted letters or numbers, clicking on specific images, or solving simple puzzles that are easy for humans but difficult for computers to solve. The purpose of CAPTCHA is to prevent spam, automated attacks, and unauthorized access by bots while allowing legitimate human users to proceed.
What is a CAPTCHA code?
- It is a challenge-response test designed to distinguish between human users and automated bots.
- Common forms include distorted text, image recognition tasks, or simple logic questions.
- It appears when users perform actions like signing up, logging in, or submitting forms on websites.
Why use CAPTCHA?
- To prevent spam, fake registrations, and automated abuse on websites.
- To protect sensitive online resources from unauthorized access by automated programs.
- To improve security by ensuring that only humans can pass certain web interactions.
How does it work?
- A distorted sequence of letters/numbers or images is displayed.
- The user must type the characters or select the correct images.
- The website verifies the response to confirm it was done by a human user.
In summary, a CAPTCHA code is a widely used tool for online security to block computer bots by posing tasks that humans can easily solve but computers cannot.
