Cloud computing is a model of computing in which computer processing, storage, software, and other services are virtualized resources. These "clouds" of computing resources can be accessed on an as$-$needed basis from any connected device and location.

When firms and individuals obtain computing power and software as services over a network, including the Internet, rather than purchasing and installing the hardware and software on their own computers, it is called $\_\_\_\_\_\_\_\_\_\_.$

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cloud computing

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green computing

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virtualization

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grid computing