If they can read the CAPTCHA correctly, they can prove that they are human and be allowed to proceed. When a user attempts to sign up for a service or submit a form on a website, they will be presented with a CAPTCHA. ![]() A human can look at the CAPTCHA and immediately know what it says, but a computer would have a very difficult time deciphering it. For example, a CAPTCHA might show the word “apple” with the letters jumbled and the background color changed. CAPTCHAs are used to protect websites from bots and automated software that can sign up for services, post comments, or even vote in online polls.Ī CAPTCHA is typically a distorted image of a word or phrase that a human can easily read, but a computer cannot.
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