All devices on the World Wide Web are identified by a special number called an IP address, such as 188.8.131.52. If you have a website, the domain that you enter to access it is for your convenience, yet the server where the site files are still has an IP address. As there're far more sites and devices than there're IPs, all shared website hosting servers have a number of sites under the same IP, while when you use a dedicated server you will have a dedicated IP too. Even in the first case though, you're able to get a dedicated IP for your websites and host them on a shared server. One benefit would be that you may get superior search engine rankings as a dedicated IP usually means a quicker loading website. Furthermore, you need such an IP when you would like to obtain an SSL certificate for your site and shield the info that visitors submit on it.