This document provides an overview of BOSH (Bosh Open Source HM) and its key concepts. It describes BOSH as a tool that unifies release engineering, deployment, and lifecycle management of cloud software. It then explains the main components of BOSH including stemcells, releases, and deployment manifests. Stemcells provide the base OS and agent, releases define jobs and packages, and manifests define the deployment configuration. The document also outlines the different flavors of BOSH and when BOSH would be used, such as for distributed systems or lifecycle management across environments.