What are three 3 key aspects of cloud computing?

[cenforceedrx]

What are three 3 key aspects of cloud computing?

[Dynapro]

Cloud computing can be broken up into three main services: Software-as-a-Service (SaaS), Infrastructure-as-a-Service (IaaS) and Platform-as-a-Service (PaaS). These three services make up what Rackspace calls the Cloud Computing Stack, with SaaS on top, PaaS in the middle, and IaaS on the bottom.

[makoo]

On-demand self-service.
Broad network access.
Multi-tenancy and resource pooling.