All devices on the Web are identified by a special number called an IP address, for example 123.123.123.123. If you have a website, the domain name that you type to be able to load it is to save you time, but the server where your website files are still has an IP. As there are a lot more websites and devices than there're IP addresses, all of the shared website hosting servers have a number of websites under the very same IP, whereas with 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 websites and host them on a shared server. One benefit would be that you will enjoy improved search engine positions as a dedicated IP generally means a faster loading site. Also, you need such an IP if you plan to purchase an SSL certificate for your site and secure the data that your visitors submit on it.
