All devices on the World Wide Web are recognized by a unique number called an IP address, for example 18.104.22.168. In case you have a website, the domain name that you enter to load it is to save you time, however the server where the site files are still has an IP. Since there're many more websites and devices than there're IP addresses, all shared web hosting servers have a number of websites under an identical IP, while with a dedicated server you will have a dedicated IP too. Even in the first case though, you can acquire a dedicated IP for your websites and host them on a shared server. One benefit would be that you will get superior search engine positions since a dedicated IP often means a quicker loading site. Furthermore, you need such an IP in case you want to get an SSL certificate for your site and shield the information that your visitors submit on it.