Are you human?
This is a question, many applications would ask on submitting a request to prevent automated attacks. You might've experienced entering distorted colorful text before the submission, that can be understood only by the human eye but by an automated bot. These are known as CAPTCHAs. It says that about 60 million CAPTCHAs are solved by humans around the world every day. This is millions of man-hrs wasted if you get the idea of re-CAPTCHA.
re-CAPTCHA will try to spend this effort in a useful way. Believe me, you are actually helping to digitize books. Instead of just typing some random text, which would be of no use to the mankind, you are digitizing a content of an old book, which appears a lil distorted as an image.
Interested? Pls continue...
And reCAPTCHA has a PHP library too.
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