Also, while some of them can be solved on one system, the other may not be solved automatically. Although they have the same aim, most of them differ in the way they function. CAPTCHA typesĮven though most internet users are not aware, there are a lot of CAPTCHA types. Site owners do not want this as most of those comments include an ad that does not benefit the site owner. Some developers can write a script that can automatically write comments to the posts. One other known usage is the prevention of the spammed comments. 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. One other specific case is whenever you use a VPN. Most users face it when registering a new account on different websites. For those unfamiliar with it, it is a kind of automated test that should set apart robots (or bots in fact) and humans. Many internet users face those riddle type quizzes and do not realize that they are called this way. 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).
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