Define captchas:
A captcha is a type of challenge-response test used in a computing to determine whether or not the user is human or not.
Spam bots:
A program that is used to send spam in order to help the users.
Positive impact:
Used to know if the user is human or not, and protect them from viruses or other malicius things in the web.
Negative impact:
Sometimes the captchas and spam doesn't work correctly and perjudice the properly user.
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