This is a captcha, which stands for "completely automated public Turing test to tell computers and humans apart." Captchas are employed by websites to prevent spam -- by requiring real people instead of automatic scripts to sign up for services on the web, companies hope to limit adding valid emails to spam lists. Now, spammers have figured out a way to get around Captchas -- pay poor Indian college students 80 cents for every 1000 they solve. The work's not great, but if you're poor and trying to put yourself through college, the money is enough to ensure a steady supply of workers.Spammers Paying Others to Solve Captchas - NYTimes.com
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