All devices on the World Wide Web are recognized by a special number called an IP address, for instance 22.214.171.124. In case you have a site, the domain that you enter to open it is to save you time, however the server where the site files are still has an IP address. Because there're many more websites and devices than there are IP addresses, all of the shared web hosting servers have a number of websites under the same IP, whereas with a dedicated server you'll have a dedicated IP too. Even in the first case though, you can get a dedicated IP for your sites and host them on a shared server. One benefit would be that you will have improved search engine positions because a dedicated IP often means a quicker loading site. What is more, you need such an IP if you plan to get an SSL certificate for your website and secure the data that visitors submit on it.