As per Wikipedia:
A CAPTCHA is a means of automatically generating challenges which intends to:
1. Provide a problem easy enough for all humans to solve.
2. Prevent standard automated software from filling out a form, unless it is specially designed to circumvent specific CAPTCHA systems.
A check box in a form that reads "check this box please" is the simplest (and perhaps least effective) form of a CAPTCHA. CAPTCHAs do not have to rely on difficult problems in artificial intelligence, although they can.
In the short term, this has the benefit of distinguishing humans from computers. In the long term, it creates an incentive to advance the state of AI
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