Free Captcha  services are any easy way to implement javascript captcha’s on your website, regardless of whether you have an ASP, PHP or Perl back end.  Fill in the simple online form to automatically create some code for your site.  Include the code into your form and you are ready to go.

Put simply, CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a challenge and response mechanism used to differentiate human input as opposed to automated input created by a computer.  It is most often used on forms on websites to reduce SPAM.

The challenge should be in a form which can be easily identified by humans but very difficult for automated processes on computers to guess or decode.  It is common for an image to be created from a series of ASCII characters (number, letters and symbols) for the challenge.

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