What is the difference between Open Access and Open Source?
Open source software, like free software, is a kind of software, namely, software whose source code is freely available for inspection or modification. Open access is a kind of access or availability. This kind of access could apply to any digital content, such as software, music, movies, or news. But the BOAI only calls for open access to a certain kind of scientific and scholarly literature. Also see our question on how the BOAI differs from other initiatives to make digital information free for users.