This article applies to Webfusion Dedicated Servers running cPanel
This article will teach you the difference between a shared IP address and an exclusive IP address.
Shared IP address
You can use a shared IP address to run an unlimited number of sites over a HTP connection.
Exclusive IP address
An exclusive IP address can only be assigned to one website alone. This type of IP address is used for websites that need an SSL certificate installed in order to run secure HTTPS connections.