An IP address is a unique number which separates a website or a server on the world-wide web, so if you have a dedicated IP, it shall be employed only by your Internet sites and will not be shared with other people as it happens with shared web hosting accounts. Provided you have your own hosting server, you shall have a dedicated IP, but you may require additional ones for a variety of purposes. Provided you have a web-based store, for instance, you shall need an SSL certificate for it, to make certain that the payment information which your clients submit shall be encrypted and safe. The same is valid in the event that you have a login form of some type and you wish the usernames and the passwords which visitors input to be secured. The SSL certificate requires a dedicated IP address, 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 need a slightly better functionality for a given site, which may influence its position in search engine results.