Cloud hosting is a web hosting service delivered from a group of connected servers. The term cloud hosting (also called clustered hosting) is not precisely defined yet. In general, however, a hosting service can be considered cloud hosting when it is delivered from a fully redundant, multi-server system, in which the resources are dynamically scalable and often virtualized.
In less technical terminology, cloud hosting uses a number of servers all connected together (a cloud), and sites on the servers can use resources from all the servers in that cloud. Processing power, hard drives, and memory are shared. Servers can be easily added or removed as necessary, and if one server is down, sites use resources from other servers instead, learn more about infrastructure service that helps http://cloudcomputing-vision.com/cloud-computing/iaas/
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