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CAPTCHA
Abbreviation for Completely Automated Public Turing Test to Tell Computers and Humans Apart
In short and in plain language
A CAPTCHA is a test that tries to tell people apart from programs.
It may show bent letters or puzzles with pictures. Forms use it to get less spam from bots.
Such tests can shut out people who see poorly or find learning hard.
There are also ways to protect a form without puzzles.
Definition
A CAPTCHA is a test intended to tell people apart from automated programs, for example with distorted letters or picture puzzles. Contact forms use it to slow down spam from bots. Such tests can exclude people with visual or learning disabilities, so there are also protection methods without puzzles.