CAPTCHA is a spam-prevention tool that requires someone filling out a form to enter in a key shown in an image in order for the form to submit successfully. CAPTCHA can be used in forms to prevent spam from being submitted.
BranchCMS supports two different types of CAPTCHA:
Image CAPTCHA presents your visitor with an image that has some text in it. They then need to enter the text that they see in a text field to validate the form.
reCAPTCHA uses Google's reCAPTCHA service to provide a more human-friendly way of validating that the form submission is valid.