Short for Completely Automated Public Turing test to tell Computers and Humans Apart, CAPTCHA is a protection that identifies humans from computers. Often, a CAPTCHA is an image of text, distorted so that humans can read it, but most automated computer vision system cannot. The picture is an example of a CAPTCHA.
In the picture, the visitor can visually identify the words "overlooks" and "inquiry" to validate they're human. Without this information being entered into the web page, a user would be unable to continue. Unfortunately, blind or hard of seeing visitors run into difficulties with CAPTCHAs because of the inability to read the letters shown in the image. To help these visitors gain access to a page protected by a CAPTCHA, an audible CAPTCHA will read the letters aloud to the visitor.
Are CAPTCHA's case sensitive?
No, a CAPTCHA is not case sensitive, so if the same words mentioned earlier were entered in uppercase it would still work.
How is CAPTCHA pronounced?
CAPTCHA is an acronym that is sounded out. So, it would be pronounced as cap-cha.
Why does website ask if I'm a robot?
Software bots are written to perform common tasks such as a form submission to advertise on a website automatically. To protect against these bots, a website asks if you're a robot as a CAPTCHA to determine if you're a human or a robot. This protection is done by analyzing the mouse movements and looking for any other irregularities as the user checks the I'm not a robot check box.