Definition of Cloud

My Own understanding

Term Description
On Demand Self Service New resource provision and old resource termination without human intervention using CLI
Broad Network Access Access Server to any network & standard mechanisms, like http(s), ssh, cli etc standard protocols and methods
Resource Pooling Loction independence, no control or knowledge of exact location of server, but high level selection (like ap-south-1 aka mumbai) is available, these resource should be pooled to multiple consumers in multi tenant mode
Rapid Elasticity Capablilities can be scaled up or down automatically and swiftly, and capabilites can appear to be unlimited
Measured Service Resource usage can be monitored, controlled, reported and billed. Billing should be on demand

In Cource

Term Description
On Demand Self Service Provision and termination using UI/CLI without human interaction
Broad Network Access Access services over any networks, on any devices, using standard protocols and methods
Resource Pooling Economies of scale, cheaper service
Rapid Elasticity Scane Up(OUT) and Down (IN) automatically response to system load
Measured Service Usage is measured, Pay for what you consume