Why captchas are used.

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asked Oct 8, 2015 in Internet & Websites by 3aalakkannan (330 points)  
Whenever I log in to websites,I always wonder why they need us to proove ourselves by typing the characters in the umage called as captcha.Has anyone got solution for the above mentioned question.thanks in advance.
   

1 Answer

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answered Oct 8, 2015 by SourabhPM (430 points)  
The captcha is a visual or audio challenge to the user to prevent bots and automated scripts from accessing the services protected by it.

It is valuable for:

forums that want to prevent spambots/adbots from signing up
protecting downloads from automated access by bots (which is not a security risk in itself, but a bandwidth drain)
Google uses it for search queries if there have been excessive numbers of queries from a single IP adress
A CAPTCHA does not provide any other kind of security, it only provides protection from bots and the rate limiting that comes with it.

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