Why Captcha?

Q: Why am I asked to enter a validation code when submitting a form?

A: A CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot. For example, humans can read distorted text, but current computer programs can't. We use this mechanism to prevent automated tools from generating spam or nuisance emails. We hope this does not cause any inconvienience.