A CAPTCHA is a program that can tell whether its user is a human or a computer. You’ve probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from “bots,” or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.
Why do you want a Captcha on your website? Here a few reasons to consider using reCAPTCHA:
- Preventing Comment Spam in Blogs
- Protecting Website Registration
- Prevent Spam for Online Polls.
- Preventing Dictionary Attacks.
- and many, many more.
If you run a website that suffers from problems with spam, you can put reCAPTCHA on your site for FREE. reCAPTCHA offers easy to install plugins for some popular web based applications such as WordPress and Mediawiki. They also have easy-to-use code for common web programming languages such as PHP.
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