An IP address is a unique number which separates an Internet site or a hosting server on the Internet, so in the event that you have a dedicated IP, it will be used solely by your Internet sites and will not be shared with other individuals as it happens with shared web hosting accounts. In case you have your own server, you'll have a dedicated IP, but you may require extra ones for various purposes. Provided you have a web-based store, for instance, you will need an SSL certificate for it, to make certain that the payment information which your clients submit will be encrypted and secure. 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 that visitors input to be secured. The SSL certificate requires a dedicated IP, which should be different from the one that you already have on the machine. You could also need a separate IP for an application such as a VoIP server, or if you need a slightly better overall performance for a particular website, which may affect its position in search engine results.