Cloud computing is the on-demand availability of computer system resources, especially data storage and computing power, without direct active management by the user. The term is generally used to describe data centers available to many users over the Internet.
Dedicated hosting service, dedicated server, or managed hosting service is a type of Internet hosting in which the client leases an entire server not shared with anyone else
A colocation center or "carrier hotel", is a type of data center where equipment, space, and bandwidth are available for rental to retail customers
Infrastructure Management Service
It is about administering and managing technology, information and data in a proactive way. Its scope ranges from the desktop to networking, storage, data, security and cloud-based services - not forgetting the people employed to keep everything working.