An IP address is a unique number that separates an Internet site or a server on the world-wide web, so if you have a dedicated IP, it will be employed only by your Internet sites and shall not be shared with other individuals as it happens with shared hosting accounts. In case you have your own web server, you will have a dedicated IP, but you may need additional ones for many different purposes. If you have an Internet store, for example, you shall need an SSL certificate for it, to make sure that the payment information that your clients submit shall be encrypted and secure. The same is valid in case you have a login form of some sort and you want the usernames and the passwords which visitors input to be secured. The SSL certificate requires a dedicated IP, which needs to be different from the one that you already have on the machine. You could also need an independent IP for an application such as a VoIP server, or if you want a slightly better functionality for a particular Internet site, which shall affect its position in search engine results.