It is a security test, based on the famous Turing test, Chad Email List used to verify that the user who wants to access an online service is a person or a computer. To certify that it is human, it will be necessary to pass some tests, although currently there is already the invisible captcha, which I will talk about in this article.
The expression CAPTCHA comes from the acronym in English “Completely Automated Public Turing test to tell Computers and Humans Apart” and was devised in 1997 by the search engine Altavista and a workgroup of the Sanctum company.
In the late 1990s, there were two concerns in the computing world, the rapid evolution of automated form validation scripts and the advancement of OCR text recognition systems. The combination of both caused the automated manipulation of certain online services, such as the submission of forms, the publication of comments or the extraction of data.
But it was in the year 2000 when Luis Von Ahn efficiently cmo email list designed a system to control all automatic advertising. At this point, Captcha was born, which has evolved over the years, especially since Google bought it.
As a curiosity to indicate that at the beginning the use of these tests helped in a gigantic way to digitize the texts. The text recognition programs were not very developed and by displaying letters and having to be recognized by the user, the programs could learn.