All devices on the World Wide Web are identified by a specific number called an IP address, for instance 220.127.116.11. In case you have a website, 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 are far more websites and devices than there are IP addresses, all the shared web hosting servers have a number of sites under the very same IP, whereas with a dedicated server you'll get a dedicated IP as well. Even in the first case though, you're able to get a dedicated IP for your sites and host them on a shared server. An advantage would be that you will enjoy better search engine positions because a dedicated IP often means a faster loading site. What is more, you need such an IP if you intend to purchase an SSL certificate for your website and protect the data that your visitors submit on it.