Have you ever been to a website, and before you can submit or view information, you have had to verify that you are not a robot?
While this might be a bit annoying (of course you are not a robot!) there is a very good reason for doing this – to stop automated software, or “bots” from abusing the website. There is any number of “bad actors” out there who would like to exploit weaknesses in your site.
To try and sort the humans from the bots, CAPTCHA was invented as a way of testing who you were: man or a machine. CAPTCHA is an acronym that stands for Completely Automated Public Turing Test to Tell Computers and Humans Apart.