by 
Drublic
ANSWERS: 2
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it is a an image of letters used to keep people from automating page submissions online ... only a human would know what the letters are and so it proves a human viewed the page
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First of all, welcome back, Drublic. Second of all, a captcha is a method of preventing automated form submissions on websites. They are basically used to verify that the user is a human, not a computer program. CAPTCHA stands for "Completely Automated Public Turing test to tell Computers and Humans Apart". The Wikipedia article is quite interesting: http://en.wikipedia.org/wiki/Captcha
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