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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 the software in any way, and the source code is openly sh ...
,
Unix-like A Unix-like (sometimes referred to as UN*X or *nix) 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 s ...
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 the
Berkeley Software Distribution The Berkeley Software Distribution (BSD) is a discontinued operating system An operating system (OS) is system software that manages computer hardware, computer software, software resources, and provides common daemon (computing), services f ...
(BSD).
Theo de Raadt Theo de Raadt (; ; born May 19, 1968) is a South African-born software engineer A software engineer is a person who applies the principles of software engineering to the design, development, maintenance, testing, and evaluation of computer sof ...
created OpenBSD in 1995 by forking
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
. According to the website, the OpenBSD project emphasizes "portability, standardization, correctness, proactive security and integrated cryptography." The OpenBSD project maintains
portable Portable may refer to: General * Portable building, a manufactured structure that is built off site and moved in upon completion of site and utility work * Portable classroom, a temporary building installed on the grounds of a school to provide ad ...
versions of many subsystems as
packages Package may refer to: Enclosures * Packaging and labeling Packaging is the art Art is a diverse range of (products of) human activities involving creative imagination to express technical proficiency, beauty, emotional power, or concep ...
for other operating systems. Because of the project's preferred BSD license, many components are reused in proprietary and corporate-sponsored software projects. The
firewall Firewall may refer to: * Firewall (computing) In computing, a firewall is a network security system that Network monitoring, monitors and controls incoming and outgoing network traffic based on predetermined security rules. A firewall typically e ...

firewall
code in
Apple An apple is an edible fruit In botany Botany, also called , plant biology or phytology, is the science of plant life and a branch of biology. A botanist, plant scientist or phytologist is a scientist who specialises in this fie ...
's
macOS macOS (; previously Mac OS X and later OS X) is a proprietary {{Short pages monitor