http is an unsecured connection to your website. https is the secure connection to your website and hosting services. Any website that has https or a padlock showing next to the domain name in the browser has an SSL certificate installed, and is therefore protected and secure.
See our SSL certificate page for more information on the types of certificates and the benefits of installing it on your domain.
NOTE: all e-commerce sites should be operating on https with an SSL certificate to ensure the data and credit card information is protected