This document provides an overview of Apache CloudStack. It begins by introducing CloudStack as a proven, hypervisor-agnostic Infrastructure as a Service (IaaS) cloud platform. It then discusses the Apache Way and process for becoming an Apache project. The document reviews CloudStack's architecture and history from its origins at Cloud.com to becoming an Apache incubator project. It covers using Publican for documentation publishing and reviews the Apache documentation and review process. It encourages joining the Apache CloudStack community through various forums and meetups.