Difference between CAPTCHA and reCAPTCHA

CAPTCHA is the human validation test (usually the blurry squiglly letters that need to be deciphered) used by many sites to prevent spam.

reCAPTCHA is a reversed CAPTCHA – the same test, used not only to prevent spam but to help in the book digitazion project. In other words, the reCAPTCHA tests are not meaningless combination of words, but excerpts from books that undergo digitation, while CAPTCHA uses several human validation methods including math or general knowledge questions, visual puzzles and even chess puzzles.

Google purchased reCAPTCHA several years ago, and now it is also used to collect street view data

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