Cloud computing describes computation, software, data access, and storage services that do not require end-user knowledge of the physical location and configuration of the system that delivers the services. The National Institute of Standards and Technology describes cloud computing as a model for enabling convenient, on-demand network access to a shared pool of configurable computing resources. that can be rapidly provisioned and released with minimal management effort or service provider interaction. In simplest terms cloud computing is the set of hardware, networks, storage, services and interfaces that combine the deliver aspects of computing as a service. Additionally, there are three main groups of participants; which include: the end user who do not have to know anything about technology; business management who needs to take responsibility for the governance of data or services within the cloud; and the cloud service provider who is responsible for IT assets and maintenance.
There are many types of cloud services; for instance: Saas (Software as a Service), Paas (Platform as a Service) and Iaas (Infrastructure as a Service). The Saas is the most popular form of cloud services. This software is built by the service provider while the end users can configure it to suit their needs and the end users cannot change or modify the software. Paas offers a platform to clients for other reasons. For example, they have software that offers developers to build, test, and host applications that can be accessed by the end users. Additionally, the end users may or may not know that the application is hosted on the cloud. Iaas offers infrastructure on demand. The infrastructure can be anything from storage servers to application to operating systems.
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