Cloud computing and applications represent a style of computing in which scalable resources are provided as a service over the Internet. Users need not have knowledge of, expertise in, or control over the technology infrastructure in the "cloud" that supports them.
With a cloud computing solution, the customer does not have a big upfront capital expenditure for hardware, software licenses and implementation services. Nor do customers have the ongoing expense of administering the hardware and infrastructure software (e.g. patches). Instead, most cloud computing solutions offer a subscription or pay-as-you-go model, so customers pay a smaller recurring operating expense based only what they used which includes the hardware, software, and administration.
The other big virtue of cloud computing was its ability to provide flexibility in scaling beyond what standard dedicated infrastructure could provide. Because cloud services are virtualized and delivered over the Internet, users can more easily increase or decrease capacity depending on their current needs.
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