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What is Image Verification ( Captcha )?
A security test to determine whether or not the user is
human. This will ensure that only human visitors will
actually submit the form, and not spamming bots that are
browsing the web from site to site and submit spam where
they can. It is well known that programmers can do programs
for many jobs, including visiting a large amount of sites on
the Internet by following links from page to page and
collect emails listed on websites, submit contact forms, or
even trying to break passwords by trying to login over and
over again with computer generated passwords.
Fortunately, it is impossible for a non-human ( ex.
computer program ) to extract a word or a combination of
letters and numbers from an image, if the letters and
numbers are not all of the same size and of similar font.
This is why, the Image Verification security method ensures
that only people actually can submit a form.
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