what is captcha

CAPTCHA is a image of words which is used to stop the spamming after filling the form. There are two types of the CAPTCHA, Audio and Visual.

sorry i do not know ..thanks for share

The term "CAPTCHA" was created in 2000 by Luis von Ahn, Manuel Blum, Nicholas J. Hopper of Carnegie Mellon University.

CAPTCHA code was created to stop automated computer spam robots from filling out forms, harvesting email addresses, and then sending out countless spam emails.

The CAPTCHA security image works by asking the website visitor to type in a code they see correctly.
A human can do this, but an automated computer
program cannot.

This is why just about all the big, well known websites are using them, like MSN, Yahoo, Google, Craigslist, and countless others.

CAPTCHA is the system where you have to type into a box the characters/words you see "hidden" in an image. This sort of system attempts to fight back against scripts/bots. In other words, by filling in the text it increases the likelihood that you're a human submitting a form :)

Captcha is a human verification system that has developed my web developers to manipulate the amount of spam and adulteration taking place on the Internet.

Captcha is a human being verification structure that is developed my web developers to organize the quantity of spam and corruption event on World Wide Web.

Quote:

---

Originally Posted by jamesdurai

HI,

A CAPTCHA or Captcha (pronounced /ˈkæptʃə/) 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 one computer (a server) asking a user to complete a simple test which the computer is able to generate and grade. Because other computers are unable to solve the CAPTCHA, any user entering a correct solution is presumed to be human. Thus, it is sometimes described as a reverse Turing test, because it is administered by a machine and targeted to a human, in contrast to the standard Turing test that is typically administered by a human and targeted to a machine. A common type of CAPTCHA requires that the user type letters or digits from a distorted image that appears on the screen.

---

I think It is a best answer of captcha for understanding of layman..

hi..
i know about captcha according to me captcha code was created to stop automated computer spam robots from filling out forms.captcha used to are mainly used by websites that offer services like online polls and registration forms.

Hi,very good answer given by you,and is useful for us

Structure that helps the body to verify the organization's World Wide Web spam My Web developers to capture the amount of corruption.

This thing termed as captcha is an appearance confirmation module that is castoff to confirm whether or not somebody is a real individual. Have you used it lately?

Captcha is the human verification system that made web developers manipulate the amount of spam as well as adulteration happening online.

CAPTCHA is the program used to protect sites against bots by getting and grading tests which can be passed by humans but not the latest computer programs.

i dont know the exact meaning... its a code which generate it self....

Many web developers to manipulate the quantity of spam and adulteration. Captcha is a human verification system.