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FreeBSD
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<p>FreeBSD is a <a href="/facts/Free_software/IaoVtJXn">free-software</a> <a href="/facts/Unix-like/YAKrAxzd">Unix-like</a> <a href="/facts/Operating_system/8XTuvMh2">operating system</a> descended from the <a href="/facts/Berkeley_Software_Distribution/XQKcURrh">Berkeley Software Distribution</a> (BSD). The first version was released in 1993 developed from <a href="/facts/386BSD/XpTXP1ca">386BSD</a>, one of the first fully functional and free <a href="/facts/Unix/0pNL2seI">Unix</a> clones on affordable home-class hardware, and has since continuously been the most commonly used BSD-derived operating system. </p><p>FreeBSD maintains a complete system, delivering a <a href="/facts/Kernel_(operating_system)/uEj4U3Rz">kernel</a>, <a href="/facts/Device_driver/rDYnHU1G">device drivers</a>, <a href="/facts/Userland_(computing)/0yIzMY8t">userland</a> utilities, and documentation, as opposed to <a href="/facts/Linux/9FvCKSTq">Linux</a> only delivering a <a href="/facts/Linux_kernel/dlkduHuA">kernel</a> and drivers, and relying on third-parties such as <a href="/facts/GNU/EpSzvJGJ">GNU</a> for system software. The FreeBSD <a href="/facts/Source_code/o9J6Jv23">source code</a> is generally released under a <a href="/facts/Permissive_software_license/TFoufrub">permissive</a> <a href="/facts/FreeBSD_License/XLtmLp5x">BSD license</a>, as opposed to the <a href="/facts/Copyleft/DHjTyl7C">copyleft</a> <a href="/facts/GPL/S75KhLSX">GPL</a> used by Linux. The project includes a <a href="/facts/Computer_security/7E5dIy7G">security</a> team overseeing all software shipped in the base distribution. Third-party <a href="/facts/Application_software/YQuj7Kog">applications</a> may be installed using the pkg <a href="/facts/Package_manager/kEX4kx7g">package management system</a> or from source via <a href="/facts/FreeBSD_Ports/CBfftt3v">FreeBSD Ports</a>. The project is supported and promoted by the FreeBSD Foundation. </p><p>Much of FreeBSD's codebase has become an integral part of other operating systems such as <a href="/facts/Darwin_(operating_system)/DogI3ptd">Darwin</a> (the basis for <a href="/facts/MacOS/Y93vVpTm">macOS</a>, <a href="/facts/IOS/mK5cggH5">iOS</a>, <a href="/facts/IPadOS/fClrmH7D">iPadOS</a>, <a href="/facts/WatchOS/zH1fkn2R">watchOS</a>, and <a href="/facts/TvOS/jDMqvvfI">tvOS</a>), <a href="/facts/TrueNAS/Il71Q8sN">TrueNAS</a> (an open-source <a href="/facts/Network-attached_storage/ABVjy8Tn">NAS</a>/<a href="/facts/Storage_area_network/e7bmhrmB">SAN</a> operating system), and the system software for the <a href="/facts/PlayStation_3/obhuo97V">PlayStation 3</a>, <a href="/facts/PlayStation_4/wMtdFnoP">PlayStation 4</a>, <a href="/facts/PlayStation_5/vJ2ahUoK">PlayStation 5</a>, and <a href="/facts/PlayStation_Vita/KEvRtFjD">PlayStation Vita</a> game consoles. The other current BSD systems (<a href="/facts/OpenBSD/xmPS9tek">OpenBSD</a>, <a href="/facts/NetBSD/PTm5HWls">NetBSD</a>, and <a href="/facts/DragonFly_BSD/U6cvpDJR">DragonFly BSD</a>) also contain a large amount of FreeBSD code, and vice-versa. </p>