A reCAPTCHA is a CAPTCHA-like system designed to establish that a computer user is human. So how does the reCAPTCHA checkbox i.e. the "I'm not a robot" checkbox actually work? Why can't bots just check 'I am not a robot' and fool the system?

 

... We explain like i'm five!

 

Thank you to the r/explainlikeimfive community, and specifically the following reddit users whose questions and responses formed the basis of this conversation: edshnee, anthonyridad, ekto_, reifenstag, solepsis, nukerx & adipisicing

 

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