Google recently announced that they will be
replacing the annoying reCAPTCHA test with a simple “I am not a robot”
check box. Captcha, standing for Completely Automated Public Turing test
to Tell Computers and Humans Apart, is designed to prevent automated
spamming of sites, by asking humans to type in distorted words or
phrases.
CAPTCHAs often appear before a user can write a comment on a blog,
create an account for a service, buy tickets for an event or fill out a
“forgot password” form. 
This is what the No CAPTCHA reCAPTCHA looks like:
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