Undoubtedly, every user of the network has met with such an urgent problem, but not everyone knows that this is the so-called captcha. In addition, not everyone knows that in English CAPTCHA is an abbreviation, which translated into Russian means: an absolutely automated and accessible Turing test to protect against spammers and other undesirable persons.

From the abbreviation deciphered above, it is already possible to understand what a captcha is, in other words, it detects whether the user is real or a spammer. For example, on most sites, to find out the price of SEO promotion, you will first need to enter a verification code. A captcha creates combinations of various letters, numbers and signs, using a person's ability to understand what symbols they actually are.

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