what is captcha

i think this link can considerably help you deal with this problem: https://kb.wisc.edu/cae/page.php?id=8232

Captcha means Completely Automated Public Turing test to tell Computers and Humans Apart. It is a challenging test to ensure that the response is only generated by human and not by computer. Captcha protect websites against spammers

@Oracle Thanks for you infomatic post all most folks talking about CAPTCHA feature and how to use but you are great you define all the thing..
Thanks

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Originally Posted by happy

hello friends, can any body tell me about captcha. And can any body help me how to put it in my website. thanks for help...

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CAPTCHA is a tool that validates that form and the fields data entered in it is coming from a real person and not something automated.

to install it on your website go to : captcha.net and sign up, once sign up, they ill give u API key, after that download the captcha script as zip file and use that script any where you want... Thanks

Captcha is a verification code when we are submitting or registering our self on a website.This is for block spamming or spammers.

CAPTCHA is the way to insure your site not used by some kind of software or else reboots.

Captcha is used for controlling the spammers. You can get captcha code from php at a low cost.

A CAPTCHA is a program that can generate and grade tests that humans can pass but current computer programs cannot.

A CAPTCHA is a program that defends a websites against spiders by producing and rating assessments that people can pass but existing applications cannot. For example, people can read distorted text, but current computer applications can't.

Captcha is a system through which it can be verified that whether human is their or there is any automated robot doing the text entries or directory submission.

It is a techniques used by most of the form submission sites to secure from automatic submission ,or prevent the form submission rules by any automated submission tool.

It is a program that can grade tests that human can pass. A CAPTCHA is a type of chalange responce test used in the computer.

A Captcha is a type of challenge-response test used in computing to ensure that the response is not generated by a computer.

CAPTCHA or Captcha (pronounced as cap-ch-uh) which stands for “Completely Automated Public Turing test to tell Computers and Humans Apart” is a type of challenge-response test to ensure that the response is only generated by humans and not by a computer.

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Originally Posted by Oracle

In a CAPTCHA test (an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart," also sometimes spelled in lowercase), an image of letters is dynamically generated. The letters, because they're part of an image and not text (e.g. text that you could cut and paste), are difficult for a spambot or other computer program to read. Yet, a person has little trouble reading the letters in a captcha image.

Using a captcha test on a website is a great way to ensure, for instance, that a person and not a spambot is filling out a web form. Also, a captcha can make it difficult for a person to continuously resubmit form information and overwhelm the form's purpose.

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Thanks for this nice information....
Can you tell me that how can i create captcha in php coding.