All devices on the World Wide Web are identified by a specific number called an IP address, for instance 123.123.123.123. If you have a site, the domain that you enter in order to load it is to save you time, yet the server where the site files are still has an IP. Considering that there are far more sites and devices than there're IP addresses, all of the shared website hosting servers have a number of websites under the same IP, while when you use a dedicated server you'll have a dedicated IP too. Even in the first case though, you will be able to acquire a dedicated IP for your sites and host them on a shared server. One benefit would be that you may enjoy better search engine rankings since a dedicated IP usually means a quicker loading site. Furthermore, you need such an IP if you plan to acquire an SSL certificate for your website and secure the data that your visitors submit on it.