What is Image Verification ( Captcha )?

A security test to determine whether or not the user is human. This will ensure that only human visitors will actually submit the form, and not spamming bots that are browsing the web from site to site and submit spam where they can.

Fortunately, it is impossible for a non-human ( ex. computer program ) to extract a word or a combination of letters and numbers from an image. This is why the Image Verification security method ensures that only people actually can submit a form.