All devices on the World Wide Web are recognized by a unique number called an IP address, such as 123.123.123.123. In case you have a site, the domain name that you type to be able to open it is to save you time, but the server where your site files are still has an IP address. Due to the fact that there are a lot more sites and devices than there are IP addresses, all the shared hosting servers have a number of sites under an identical IP, while using a dedicated server you'll have a dedicated IP as well. Even in the first case though, you can obtain a dedicated IP for your websites and host them on a shared server. One benefit would be that you may have far better search engine positions since a dedicated IP usually means a quicker loading site. In addition, you need such an IP in case you plan to acquire an SSL certificate for your website and shield the data that visitors submit on it.