The National Institute of Standards and Technology NIST definition lists five essential characteristics of cloud computing: on-demand self-service, broad network access, resource pooling, rapid elasticity or expansion, and measured service. Private cloud has failed to deliver on the promise or economics of cloud, as it lacks many of these key characteristics. Likewise, hybrid cloud retains many of the flawed characteristics of private cloud. This is why multi-cloud which is rapidly becoming the de-facto standard for cloud architectures as organisations seek to optimise workloads while avoiding vendor lock-in.

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