Question

captcha is a program that is used to vary a computer​

Answer 1

Explanation:

A CAPTCHA (/kæp.tʃə/, an acronym for "completely automated public Turing test to tell computers and humans apart") is a type of challenge–response test used in computing to determine whether or not the user is human. The term was coined in 2003 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper, and John Langford.

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Answer 2

Explanation:

ya captcha is made just for deference between boys and real human it is the reason why some websites use captcha program to protect their site form bot as more than 20% of users in net are bot