A CAPTCHA is a program that can generate distorted text that humans can see or listen but computer cannot.
Applications of CAPTCHA systems
-- Preventing Spam in Blogs.
-- Protecting Website Registration.
-- Search Engine Bots.
-- Worms and Spam.
In web application development we can use the following CAPTCHA systems that are listed below
reCAPTCHA - In this type of CAPTCHA systems user can view the distorted text or also listen the text, now a days it is most popular CAPTCHA systems for web developers
Securimage : The Securimage Captcha script is free open-source. here the PHP script is used to generat complex images and complex CAPTCHA alphanumeric codes.
FreeCap - This script support GPL CAPTCHA script systems to stop spam
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