What is Image Verification (Captcha)?

A security test to ensure the form is being submitted is human and not by automated computers. These computers browse the web from site to site submitting junk messages and spam where they can.

Fortunately, computers are unable to extract a word or a combination of letters and numbers from an image, if the letters and numbers are not all of the same size and of similar font. This is why, the Image Verification security method ensures that only people actually can submit a form.