What exactly is cloud computing?

AA way to organise desktop computers

BSoftware that takes up little space on a hard drive

CComputing resources that can be accessed on demand, like electricity from a utility ✓ Correct

DThe world wide web

Correct answer: (C) Computing resources that can be accessed on demand, like electricity from a utility

Explanation

Cloud computing means computing resources are delivered on demand over the internet, billed like electricity from a utility.

Servers, storage and software sit in remote data centres and users pay only for what they use.

Arranging desktop computers is just physical layout of machines and has nothing to do with on-demand services.

Software that takes little hard-drive space describes a compact program, not the shared remote resource model.

The world wide web is a system of linked web pages, one service that may run on the cloud but is not the cloud itself.

Common cloud models are IaaS, PaaS and SaaS, offering infrastructure, platforms and ready software respectively.

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