cloud computing

Cloud is a parallel and distributed computing system consisting of a collectionofinter-connected and virtualized computers that are dynamically provisioned and presentedasoneor more unified computing resources based on service- level agreements (SLA) establishedthrough negotiation between the service provider and consumers.”
“Clouds are a large pool of easily usable and accessible virtualized resources (suchashardware, development platforms and/or services). These resources can be dynamicallyreconfigured to adjust to a variable load (scale), allowing also for an optimumresourceutilization”
“This pool of resources is typically exploited by a pay-per-use model in which guaranteesareoffered by the Infrastructure Provider by means of customized Service Level Agreements.”“Clouds are hardware based services offering compute, network, and storage capacitywhereHardware management is highly abstracted from the buyer, bu