This document provides an overview comparison of open source vs proprietary web content management systems (CMS). It discusses that open source CMS are built and maintained by communities, allow modifications to source code, and are typically free, while proprietary CMS are built and maintained by single companies, do not provide access to source code, and require licensing fees. It then examines factors to consider for each type of CMS such as support, customization options, and potential issues. Popular open source and proprietary CMS are also listed. The document concludes with an introduction to using WordPress, covering the differences between WordPress.com and WordPress.org.