HTTPS (Hyper Text Transfer Protocol Secure) is the secure version of HTTP. It is recommended to pay for an SSL Certificate to get the HTTPS protocol if your website displays or asked for sensitive information such as social security numbers, credit card numbers, etc. If you are on a website where you are about to enter sensitive information like this take a look at the web browser and make sure it says HTTPS instead of HTTP. In some browsers, a padlock appears in the URL window as well. Note: If some of the images of the page are linked to HTTP instead of HTTPS the browser will say that the website is insecure.