A dedicated IP is an IP address dedicated to the needs of one website and is not shared with others.
An IP address can also be thought of as the equivalent of a street address or a phone number (compare: VoIP (voice over (the) internet protocol)) for a computer or other network device on the Internet. Just as each street address and phone number uniquely identifies a building or telephone, an IP address can uniquely identify a specific computer or other network device on a network.
With a dedicated IP you do not share the same street address as in the case of an apartment complex. You have your own street address as a seperate house.
SSL certificates require a dedicated IP as do some special scripts.
We offer dedicated IPs to all of our clients as an upgrade option.