The essential characteristics for Cloud Computing are on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service.

云计算的关键特征是按需获取自助式服务、广阔的互联网访问、资源池、快速伸缩和可度量的服务。

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The Value of Partial Resource Pooling: Should a Service Network Be Integrated or Product-Focused?

部分资源集中的价值：服务网络应是综合的还是以产品为中心？

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Resource pooling is the ability of a cloud to serve multiple customers using a multi-tenant model with different physical and virtual resources dynamically assigned and reassigned according to demand.

FORBES: The Economic Benefit of Cloud Computing

In other words, they are a sort of savior-entity attempting to address the issue of scarcity and resource depletion by rescuing Earth (and Mars, as well as many other planets) from self-destruction by pooling our resources with a potentially unlimited number of other planets throughout the universe.

FORBES: Aliens, Global Warming, and the Intergalactic Arms Race