This document provides an overview of cloud computing, including its definition, architecture, advantages, drawbacks, and examples. It discusses the three main layers of cloud computing - Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS). Examples are given for each layer. Survey results are presented on the usage of each layer by academic institutions. Finally, the document demonstrates virtualization with a live demo of creating virtual machines using VMware Server 2.