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'Free and open-source software' ('F/OSS', 'FOSS') or 'free/libre/open-source software' ('FLOSS') is software that is both free software and open source. It is liberally licensed to grant users the right to use, copy, study, change, and improve its design through the availability of its source code.<ref>last=Free Software Foundation|title=What is free software?|url=http://www.gnu.org/philosophy/free-sw.html|accessdate=14 December 2011</ref> This approach has gained both momentum and acceptance as the potential benefitsdate=April 2012 have been increasingly recognized by both individuals and corporations.<ref>url = http://www.informationweek.com/story/showArticle.jhtml?articleID=168600351 |title = LinuxWorld Showcases Open-Source Growth, Expansion |accessdate =25 November 2007 |last = Hatlestad |first = Luc |date = 9 August 2005 |work = InformationWeek |publisher = CMP Media, LLC |archiveurl = http://www.webcitation.org/5Tchd69ij |archivedate = 25 November 2007 </ref><ref>url = http://www.informationweek.com/windows/showArticle.jhtml?articleID=196901596&subSection=Open+Source |title = Study Finds Open Source Benefits Business |dateformat = |accessdate =11 2 5 2007 |last = Claburn |first = Thomas |date = 17 January 2007 |work = InformationWeek |publisher = CMP Media LLC |archiveurl = http://www.webcitation.org/5TchF5fkl |archivedate = 25 November 2007 </ref>

In the context of free and open-source software, free refers to the freedom to copy and re-use the software, rather than to the price of the software. The Free Software Foundation, an organization that advocates the free software model, suggests that, to understand the concept, one should „think of free as in free speech, not as in free beer“.<ref>url = http://www.gnu.org/philosophy/free-sw.html |publisher = GNU.org |title = The Free Software Definition |accessdate =4 February 2010 </ref>

FOSS is an inclusive term that covers both free software and open source software, which despite describing similar development models, have differing cultures and philosophies.<ref>Feller (2005), p. 89, 362</ref>

Free software focuses on the fundamental freedoms it gives to users, whereas open source software focuses on the perceived strengths of its peer-to-peer development model.<ref>Feller (2005), pp. 101–106, 110–111.</ref> FOSS is a term that can be used without particular bias towards either political approach.

Free software licences and open source licenses are used by many software packages. While the licenses themselves are in most cases the same, the two terms grew out of different philosophies and are often used to signify different distribution methodologies.<ref>url = http://www.gnu.org.ua/philosophy/free-software-for-freedom.html |title = Why "Free Software" is better than "Open Source" |accessdate =25 November 2007 |last = Barr |first = Joe |year = 1998 |publisher = [[Free Software Foundation]] |archiveurl = http://www.webcitation.org/5TchyyzYm |archivedate = 25 November 2007 </ref>