The document discusses cloud computing, beginning with an explanation of why it is called "cloud" computing based on the visual representation of networks. It then provides definitions of cloud computing, including that it is a model for on-demand access to shared configurable computing resources over a network. The document outlines the essential characteristics of cloud computing including on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service. It also describes the deployment models of public, private, hybrid, and community clouds and the service models of Infrastructure as a Service, Platform as a Service, and Software as a Service. Advantages include improved performance, reduced costs, unlimited storage, increased reliability, universal access, availability of the latest