Cloud computing, often referred to as simply “the cloud,” is the delivery of on-demand computing resources—everything from applications to data centers—over the internet on a pay-for-use basis.

• Elastic resources—Scale up or down quickly and easily to meet demand
• Metered service so you only pay for what you use
• Self service—All the IT resources you need with self-service access

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https://www.ibm.com/cloud-computing/learn-more/what-is-cloud-computing/