CAPTCHAS are the computer resources that are used on the web to combat spam through verification processes that come from the so-called "Turing test". They are intended to avoid automatically generated entries, which test the conversion rates of the site and compromise SEO.
The word CAPTCHA is an abbreviation of the acronym derived from “Completely Automated Public Turing test to tell Computers and Humans Apart”. Therefore, the term itself tells us that, in reality, it is about differentiating people from computers through the use of automated tests.
Do you remember having entered a website and, when completing a form or commenting on a blog entry, having to take a test indicating the letters that a self-generated image shows you? That's what CAPTCHAS are! This way we make sure that behind the web interactions there are human people and with good intentions.
In this way, by means of the verification test of the CAPTCHAS, it is possible to prevent bots from interacting with the webs and leaving their comments spam , with links coming from unreliable sites and that pose a considerable hindrance to the user experience .
Who created them, when and why
Luis von Ahn was the 22-year-old who, in 2000, at Carnegie Mellon University, invented the computer system to control the large amount of spam that was proliferating then and during the 1990s. In order to challenge the Turing test, the CAPTCHA emerged, the kind of puzzle that machines cannot solve. An instrument with which it was necessary to recognize the camouflaged and visually distorted letters and numbers in an image to demonstrate that the interaction came from a person and not from a computer program.
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