what is captcha

A CAPTCHA is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a person

A CAPTCHA is a type of challenge-response test used in computing as an attempt to ensure that the response is generated by a person.

Hey ! According to me Captcha is something which was created to stop automated computer spam robots from filling out forms, harvesting email addresses and other..

now i know what is captcha
thank you all

A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a challenge-response system test designed to differentiate humans from automated programs. A CAPTCHA differentiates between human and bot by setting some task that is easy for most humans to perform but is more difficult and time-consuming for current bots to complete.

Captcha is one type of a challenging quiz which is used to stop automatic submissions by some black hat softwares or some robots. I think captache is a paid algorithm. So you have to pay for it to place it in your site.

Captcha prevent robot registration.It check visitor is human or not.

A Captcha code is a type of challenge or response or test used in computing as an attempt to ensure that the response is generated by a person. The process usually involves a computer asking a user to complete a simple test which the computer is able to grade.

To upset the attempts of the spammers the term Captcha is used. An image is put in here which has to be written on a given box before submitting something or proceeding.

I think CAPTCHA is a type of challenge used in computing to ensure that the response is not generated by the computer or we can say that it is an image that generates some numerical and alphabetical code and some time its called reverse tuning test.

The term CAPTCHA (for Completely Automated Public Turing Test To Tell Computers and Humans Apart) was coined in 2000 by Luis von Ahn, Manuel Blum, Nicholas Hopper and John Langford of Carnegie Mellon University. At the time, they developed the first CAPTCHA to be used by Yahoo.

Hello,

For non spam verification CAPTCHA does a good work. But it needs some softwares like GD, imagemagic, freetype to work correctly from server. It also depend upon the OS type you are using for your site.

yep, catcha is made to stop automated spammers on entering your websites :)

The word of CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. CAPTCHA is a program that protects websites against spammers by generates and grade tests that humans can pass but current computer programs cannot. Also CAPTCHA is a very good secure for users from spam bots.

A Captcha is a type of challenge-response test used in computing to ensure that the response is not generated by a computer.. The process usually involves a computer asking a user to complete a simple test which the computer is able to grade. These tests are designed to be easy for a computer to generate, but difficult for a computer to solve, so that if a correct solution is received, it can be presumed to have been entered by a human.