AdvertisementsĬAPTCHA is used by websites to prevent unwanted traffic, such as automated scripts and bots, from logging in, signing up, or simply browsing their content, as it increases traffic dramatically and may lead to spamming. A Turing test is a way to determine whether a machine is capable of thinking like a human being. The acronym CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. Bypass CAPTCHA on Google Chrome, Mozilla Firefox, Microsoft Edge, Opera, Vivaldi.