Captcha an acronym against the English "test, the public is quite Turing to separate out human and computer". a system security and the evaluation process is to prevent some attack by the subversive robot, internet goes to work. This process can determine the visitors to a website or other online services are human or computer. To this end, the program CAPTCHA test that will generate that only humans are able to respond to them. Because computers and software current probably can answer correctly to this test, will lose, every user that it correct solve, one assumes.