Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.Free and open-source software, also F/OSS, FOSS, or FLOSS (free/libre/open source software) is software that is liberally licensed to grant the right of users to study, change, and improve its design through the availability of its source code. This approach has gained both momentum and acceptance as the potential benefits have been increasingly recognized by both individuals and corporate players. Newcomers to the subject can be confused by clear the term "free". In the context of free and open source software, "free" is intended to refer to the freedom to copy and re-use the software, rather than to the price of the software. Advocates of the "freedom" meaning often describe it by saying "free as in freedom, not free as in [free] beer". Free and open source software is an inclusive term which covers both free software and open source software which, despite describing similar development models, have differing cultures and philosophies. Free software focuses on the philosophical freedoms it gives to users while open source focuses on the perceived strengths of its peer-to-peer development model.