A CAPTCHA ( /ˈkęp.tʃə/) is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a human being.
The process usually involves a computer asking a user to complete a simple test which the computer is able to grade.
These tests are designed to be easy for a computer to generate but difficult for a computer to solve.
If a correct solution is received, it can be presumed to have been entered by a human.
A common type of CAPTCHA requires the user to type letters and/or digits from a distorted image that appears on the screen.
Such tests are commonly used to prevent unwanted internet bots from accessing websites.
CAPTCHA - Wikipedia, the free encyclopedia
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Since 2009, CAPTCHA advertising has become much more prevalent. Publishers like AOL, Meredith Corporation,[6] and Internet Brands [7] have adopted the option as an additional revenue stream. Users typically type in brand messages instead of distorted text.[8] Leaders in the space are Solve Media, AdsCaptcha, and NuCAPTCHA, among others.[9]
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