An IP address is a unique number which identifies an Internet site or a web server on the world-wide web, so if you have a dedicated IP, it shall be employed solely by your Internet sites and will not be shared with others as it happens with shared hosting accounts. In case you have your own server, you'll have a dedicated IP, but you may need extra ones for a variety of purposes. In case you have an electronic store, for example, you shall need an SSL certificate for it, to make sure that the payment information which your clients submit will be encrypted and safe. The same is valid if you have a login form of some sort and you wish the usernames and the passwords that visitors enter to be secured. The SSL certificate requires a dedicated IP address, which ought to be different from the one that you already have on the hosting server. You might also need an individual IP for an application such as a VoIP server, or if you desire a slightly better functionality for a particular Internet site, which may influence its position in search engine results.