All devices on the World Wide Web are recognized by a unique number called an IP address, for example 22.214.171.124. When you have a site, the domain name that you enter to access it is to save you time, but the server where the site files are still has an IP address. Due to the fact that there're far more sites and devices than there are IP addresses, all the shared web hosting servers have a number of sites under an identical IP, while using a dedicated server you'll get a dedicated IP too. Even in the first case though, you're able to obtain a dedicated IP for your sites and host them on a shared server. One advantage would be that you will enjoy improved search engine rankings as a dedicated IP usually means a faster loading website. What's more, you need such an IP in case you want to get an SSL certificate for your site and shield the data that visitors submit on it.