CAPTCHAEdit
Redirected from Completely Automated Public Turing test to tell Computers and Humans Apart
A CAPTCHA or Completely Automated Public Turing test to tell Computers and Humans Apart is a an automated system that requires a user to complete a simple task in order to prove that he/she is a human and not a computer. The test should be easy for a human but computationally difficult, infeasible or impossible for a computer.