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The Berkeley Software Distribution (BSD) is a discontinued
operating system An operating system (OS) is system software System software is software designed to provide a platform for other software. Examples of system software include operating systems (OS) like macOS, Linux, Android (operating system), Android and Mi ...

operating system
based on
Research Unix The term "Research Unix" refers to early versions of the Unix operating system for PDP-7, DEC PDP-7, PDP-11, VAX and Interdata 7/32 and 8/32 computers, developed in the Bell Labs Computing Sciences Research Center (CSRC). History The term ''Res ...
, developed and distributed by the
Computer Systems Research Group :''CSRG may also refer to China South Locomotive and Rolling Stock Industry (Group) Corporation CSR Group Corporation formerly known as China South Locomotive and Rolling Stock Industry (Group) Corporation (abbreviation: CSRG), was a Chinese loc ...
(CSRG) at the
University of California, Berkeley The University of California, Berkeley (UC Berkeley, Berkeley, Cal, or California) is a public university, public land-grant university, land-grant research university in Berkeley, California. Established in 1868 as the University of California ...

University of California, Berkeley
. The term "BSD" commonly refers to its descendants, including
FreeBSD FreeBSD is a free and open-source Free and open-source software (FOSS) is software Software is a collection of Instruction (computer science), instructions and data (computing), data that tell a computer how to work. This is in contrast ...

FreeBSD
,
OpenBSD OpenBSD is a security-focused, free and open-source Free and open-source software (FOSS) is software that is both free software and open-source software where anyone is free software license, freely licensed to use, copy, study, and change ...
,
NetBSD NetBSD is a based on the (BSD). It was the first open-source BSD descendant officially released after was . It continues to be actively developed and is available for many platforms, including servers, desktops, handheld devices, and s. Th ...

NetBSD
, and
DragonFly BSD DragonFly BSD is a free and open-source Free and open-source software (FOSS) is software that is both free software and open-source software where anyone is free software license, freely licensed to use, copy, study, and change the software ...
. BSD was initially called Berkeley Unix because it was based on the
source code In , source code is any collection of code, with or without , written using a ''human-readable'' , usually as . The source code of a program is specially designed to facilitate the work of computer s, who specify the actions to be performed ...

source code
of the original
Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser Multi-user software is computer software Software is a collection of Instruction (computer science), instructions and data (computing), data that tell a computer how to ...

Unix
developed at
Bell Labs Nokia Bell Labs (formerly named Bell Labs Innovations (1996–2007), AT&T Bell Laboratories (1984–1996) and Bell Telephone Laboratories (1925–1984)) is an American industrial research and scientific development company A company, abbrev ...
. In the 1980s, BSD was widely adopted by
workstation A workstation is a special computer designed for technical or computational science, scientific applications. Intended primarily to be used by one person at a time, they are commonly connected to a local area network and run multi-user operating ...
vendors in the form of proprietary Unix variants such as DEC
Ultrix Ultrix (officially all-caps ULTRIX) is the brand name of Digital Equipment Corporation Digital Equipment Corporation (DEC ), using the trademark Digital, was a major American company in the computer industry from the 1960s to the 1990s. The compa ...
and
Sun Microsystems Sun Microsystems, Inc. (Sun for short) was an American technology company that sold computer A computer is a machine that can be programmed to Execution (computing), carry out sequences of arithmetic or logical operations automatically. M ...
SunOS SunOS is a Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser Multi-user software is computer software Software is a collection of Instruction (computer science), instructions and data (computing), data that tell ...
due to its permissive licensing and familiarity to many technology company founders and engineers. Although these proprietary BSD derivatives were largely superseded in the 1990s by UNIX
SVR4 Unix System V (pronounced: "System Five") is one of the first commercial versions of the Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser Multi-user software is computer software Software is a collection of In ...
and
OSF/1 OSF/1 is a variant of the Unix Unix (; trademarked as UNIX) is a family of multitasking, multiuser Multi-user software is computer software Software is a collection of Instruction (computer science), instructions and data (computing), d ...
, later releases provided the basis for several
open-source Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. The open-source model is a decentralized softwar ...
operating systems including
FreeBSD FreeBSD is a free and open-source Free and open-source software (FOSS) is software Software is a collection of Instruction (computer science), instructions and data (computing), data that tell a computer how to work. This is in contrast ...

FreeBSD
,
OpenBSD OpenBSD is a security-focused, free and open-source Free and open-source software (FOSS) is software that is both free software and open-source software where anyone is free software license, freely licensed to use, copy, study, and change ...
,
NetBSD NetBSD is a based on the (BSD). It was the first open-source BSD descendant officially released after was . It continues to be actively developed and is available for many platforms, including servers, desktops, handheld devices, and s. Th ...

NetBSD
,
DragonFly BSD DragonFly BSD is a free and open-source Free and open-source software (FOSS) is software that is both free software and open-source software where anyone is free software license, freely licensed to use, copy, study, and change the software ...
,
Darwin Darwin most often refers to: * Charles Darwin (1809–1882), English naturalist and writer, best known as the originator of the theory of biological evolution by natural selection * Darwin, Northern Territory, a capital city in Australia * Darwin ( ...
, and
TrueOS TrueOS (formerly PC-BSD or PCBSD) is a discontinued Unix-like A Unix-like (sometimes referred to as UN*X or *nix) operating system is one that behaves in a manner similar to a Unix system, while not necessarily conforming to or being certified t ...
. These, in turn, have been used by proprietary operating systems, including
Apple An apple is an edible fruit produced by an apple tree (''Malus domestica''). Apple fruit tree, trees are agriculture, cultivated worldwide and are the most widely grown species in the genus ''Malus''. The tree originated in Central Asia, wher ...
's
macOS macOS (; previously Mac OS X and later OS X) is a Proprietary software, proprietary graphical user interface, graphical operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for ...
and
iOS iOS (formerly iPhone OS) is a mobile operating system created and developed by Apple Inc. exclusively for its hardware. It is the operating system that powers many of the company's mobile devices, including the iPhone and iPod Touch; the t ...

iOS
, which derived from them, and
Microsoft Windows Microsoft Windows, commonly referred to as Windows, is a group of several proprietary {{Short pages monitor
BSDCan
a conference in Ottawa, Ottawa, Ontario, Canada, held annually in May since 2004, in June since 2015
AsiaBSDCon
a conference in Tokyo, held annually in March of each year, since 2007
mdoc.su – short manual page URLs for FreeBSD, OpenBSD, NetBSD and DragonFly BSD
a web-servic
written
in nginx
BXR.SU – Super User's BSD Cross Reference
a userland and kernel source code search engine based on OpenGrok and nginx {{Authority control Berkeley Software Distribution, 1977 software Free software operating systems Free software programmed in C Operating system families Science and technology in the San Francisco Bay Area University of California, Berkeley