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4. Ubuntu Cloud
Cloud computing is a computing model that allows vast pools of resources to be allocated on-demand. These resources such as storage, computing power, network and software are abstracted and delivered as a service over the Internet anywhere, anytime. These services are billed per time consumed similar to the ones used by public services such as electricity, water and telephony. Ubuntu Cloud Infrastructure uses OpenStack open source software to help build highly scalable, cloud computing for both public and private clouds.