All devices on the Internet are identified by a specific number called an IP address, for example 22.214.171.124. When you have a website, the domain name that you enter in order to access it is to save you time, yet the server where the site files are still has an IP. Because there're far more websites and devices than there are IPs, all shared website hosting servers have a number of sites under the very same IP, whereas using a dedicated server you'll be given a dedicated IP as well. 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 improved search engine positions because a dedicated IP often means a quicker loading website. Also, you need such an IP when you intend to get an SSL certificate for your website and shield the info that visitors submit on it.