All devices on the Web are recognized by a special number called an IP address, for example 184.108.40.206. If you have a site, the domain name that you type to load it is for your convenience, but the server where the site files are still has an IP. Due to the fact that there are far more websites and devices than there're IPs, all of the shared web hosting servers have a number of sites under the same IP, whereas with a dedicated server you'll have a dedicated IP as well. Even in the first case though, you will be able to acquire a dedicated IP for your websites and host them on a shared server. One benefit would be that you may enjoy improved search engine positions since a dedicated IP generally means a faster loading website. What is more, you need such an IP when you want to purchase an SSL certificate for your website and shield the info that your visitors submit on it.