Captcha — automated computer test that is used to distinguish who the user of the system is: a person or a computer. The main idea and ideas of the test: to offer the user a task that can be solved by a person without problems, but is very difficult and time-consuming for a computer.

The disadvantage of a captcha is that it is not always possible to disassemble it. Because of this, the user sometimes has to enter a captcha several times, which causes some inconvenience. By itself, it cannot stop spammers. In addition, captcha is often used where it is not necessary, for example, file hosting, which brings captcha recognition services to the masses and makes it even more inefficient.

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