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What is CAPTCHA?
It is doubtful that there exists an internet user who has never faced a CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart). Many internet users face those riddle type quizzes and do not realize that they are called this way. For those unfamiliar with it, it is a kind of automated test that should set apart robots (or bots in fact) and humans. Most users face it when registering a new account on different websites. One other specific case is whenever you use a VPN. Since many users use IP in a VPN at the same time, websites might take it as though a lot of people are trying to access the site from the same address.
Read More »CAPTCHA – A problem or a solution