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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