Free and open-source software

Free and open-source software (FOSS) is a term used to refer to groups of software consisting of both free software and open-source software, where anyone is freely licensed to use, copy, study, and change the software in any way, and the source code is publicly available so that people are encouraged to improve the design of the software. This is in contrast to proprietary software, where the software is under restrictive copyright or licensing and the source code is hidden from the users.

"FLOSS", "FOSS", and "Free and Open-source" redirect here. For hardware, see Open-source hardware. For other uses of "Foss", see Foss (disambiguation). For other uses of "Floss", see Floss (disambiguation).

FOSS maintains the software user's civil liberty rights via the "Four Essential Freedoms" of free software. Other benefits of using FOSS include decreased software costs, increased security against malware, stability, privacy, opportunities for educational usage, and giving users more control over their own hardware. Free and open-source operating systems such as Linux and descendants of BSD are widely used today, powering millions of servers, desktops, smartphones, and other devices. Free-software licenses and open-source licenses are used by many software packages today. The free software movement and the open-source software movement are online social movements behind widespread production, adoption and promotion of FOSS, with the former preferring to use the terms FLOSS, free or libre.

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