Answer:
CAPTCHA =”Completely Automated Public Turing test to tell Computers and Humans Apart."
It means that it’s kind of test which a human can pass but a computer program cannot pass it. It is used almost in every site when you make a sign up. Captcha is an image with some distorted text. It can have only alphabets, numbers or both depend on the programmer.
It is used to stop spamming as using web bots the process of sign up or submitting feedback can be made automatic. But having Captcha as additional level input stops web bots from doing successful spamming as web bots cannot read Captcha image content.
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