Captcha is the term used to describe problems that cannot be solved by computers and even supercomputers with artificial intelligence
(AI), although they appear to be relatively simple for the human brain.With a corresponding test, the captcha test, a computer determines whether its communication partner is a human or another computer. For this purpose, it confronts its counterpart with a problem that a computer, according to the current state of development, cannot solve or cannot solve in a reasonable time. The tasks to
be solved are problems for which a human brain provides solutions. These are simple logical tasks with visual and acoustic perceptions.
. Captchas are often characters that run into each other or overlap each other.
Distorting characters, using colors, lines and shapes are also used to prevent computers from interpreting these characters. Other approaches use picture puzzles, requiring recognition of a particular animal or plant. Still others pose simple math problems. The purpose of all these captcha is to keep spammers and hackers away from websites that would have to interpret captcha first.