reCAPTCHA is a type of verification designed to cut down on the amount of junk mail being sent through forms on your website, helping to ensure the majority of your website enquiries are legitimate.
Using an advanced risk analysis engine, the reCAPTCHA (provided by Google) allows your users to verify they are human with a simple click on a box. An extra level of security exists if any doubts are flagged. The reCAPTCHA is fully responsive and accessible for visually impaired users. Best yet, web browsers will cache the response meaning your customer will, in most cases, only need to check the box once and the form will remember for future.
Take a look at the screenshot below to see how the reCAPTCHA looks on a Create website.