This document discusses open source software and free software. It defines open source software as software that users can freely use, modify and distribute. Free software is similar but focuses on four specific freedoms: freedom of use, copying, modifying and contributing. Open source draws on a global community of developers and users to drive innovation through collaborative development and peer review. Quality is controlled through release managers and community governance. The community is crucial to an open source project's growth. Crowdsourcing of labor from interested community members can produce high quality results.