This presentation provides an overview of open source software, including its definition, history, benefits, myths, and examples of use in business, government, and standards. Key points covered include the open source definition of free redistribution and source code integrity, its origins in the free software movement started by Richard Stallman, and benefits like collaboration and bug fixing. Examples are given of open source server and client applications as well as demonstration of Plone and GNU/Open Office. Adoption of open source in sectors like government, healthcare and business is also discussed.