All devices on the Internet are recognized by a special number called an IP address, for example 123.123.123.123. When you have a site, the domain name that you type to open it is to save you time, yet the server where the site files are still has an IP. Due to the fact that there're far more websites and devices than there're IPs, all the shared website hosting servers have a number of sites under an identical IP, while with a dedicated server you'll get a dedicated IP as well. Even in the first case though, you will be able to get a dedicated IP for your websites and host them on a shared server. One benefit would be that you will enjoy better search engine rankings because a dedicated IP generally means a quicker loading site. In addition, you need such an IP if you would like to purchase an SSL certificate for your site and shield the information that your visitors submit on it.