All devices on the Web are recognized by a special number called an IP address, for example 220.127.116.11. When you have a site, the domain that you type to be able to load it is to save you time, yet the server where your site files are still has an IP. Due to the fact that there're a lot more websites and devices than there are IPs, all the shared web hosting servers have a number of websites under an identical IP, while using a dedicated server you will have a dedicated IP as well. Even in the first case though, you will be able to obtain a dedicated IP for your sites and host them on a shared server. One benefit would be that you may get improved search engine positions since a dedicated IP usually means a faster loading site. What is more, you need such an IP when you want to obtain an SSL certificate for your site and secure the info that your visitors submit on it.