What is Cloud? What is Cloud Computing?
Accordingly NIST, The cloud computing in short is:
Cloud computing is a model for enabling ubiquitous, convennient, on-demand networks access to a shared pool of configurable computing resources (.e.g., networks, servers, storage, applications, and services). These resources can be rapidly provisioned and released with minimal management effort or service provider interaction.
Cloud model is composed of five essential characteristics (Rapid elasticity, on-demand self-service, broad network access, resource pooling, measured services), three service models (SaaS, PaaS, IaaS), and four deployment models (private, community, public, hybrid).
Case studies
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AWS
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Azure