Cloud computing is the on-demand availability of computer system resources. Especially used for 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. Large clouds, predominant today, often have functions distributed over multiple locations from central servers. If the connection to the user is relatively close, it may be designated an edge server.
Clouds may be limited to a single organization (enterprise cloud), or be available to many organizations (public cloud).

Challenges and Solutions




On-demand self-service

An organization can unilaterally provision computing capabilities. Capabilities such as server time and network storage, as needed automatically without requiring human interaction with each service provider.


Broad network access

Capabilities are available over the network and accessed through standard mechanisms that promote use by heterogeneous thin or thick client platforms.


Resource pooling

The provider’s computing resources are pooled to serve multiple consumers using a multi-tenant model, with different physical and virtual resources dynamically assigned and reassigned according to consumer demand.


Rapid elasticity

Capabilities can be elastically provisioned and released, in some cases automatically, to scale rapidly outward and inward commensurate with demand. The capabilities available for provisioning often appear unlimited and can be appropriated in any quantity at any time.


Measured service

Cloud systems automatically control and optimize resource use by leveraging a metering capability appropriate to the type of service (e.g., storage, processing, bandwidth, and active user accounts). Resource usage can be monitored, controlled, and reported, providing transparency for both the provider and the user of the utilized service.

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