An IP address is a unique number which separates an Internet site or a web server on the Internet, so in the event that you have a dedicated IP, it will be employed solely by your Internet sites and will not be shared with other individuals as it happens with shared website hosting accounts. In case you have your own server, you'll have a dedicated IP, but you may need additional ones for many different uses. In case you have a web-based store, for instance, you shall need an SSL certificate for it, to ensure that the payment information which your customers submit shall be encrypted and safe. The same is valid in the event that you have a login form of some sort and you would like the usernames and the passwords which visitors type in to be secured. The SSL certificate requires a dedicated IP, which has to be different from the one that you already have on the machine. You could also need an individual IP for an app such as a VoIP server, or if you would like a slightly better performance for a particular website, which may influence its position in search engine results.