> **Darwin** is the core [Unix](https://en.wikipedia.org/wiki/Unix "Unix") [operating system](https://en.wikipedia.org/wiki/Operating_system "Operating system") of [macOS](https://en.wikipedia.org/wiki/MacOS "MacOS") (previously OS X and Mac OS X), [iOS](https://en.wikipedia.org/wiki/IOS "IOS"), [watchOS](https://en.wikipedia.org/wiki/WatchOS "WatchOS"), [tvOS](https://en.wikipedia.org/wiki/TvOS "TvOS"), [iPadOS](https://en.wikipedia.org/wiki/IPadOS "IPadOS"), [visionOS](https://en.wikipedia.org/wiki/Apple_Vision_Pro "Apple Vision Pro"), and [bridgeOS](https://en.wikipedia.org/wiki/BridgeOS "BridgeOS"). It previously existed as an independent [open-source](https://en.wikipedia.org/wiki/Open-source_software "Open-source software") operating system, first released by [Apple Inc.](https://en.wikipedia.org/wiki/Apple_Inc. "Apple Inc.") in 2000. It is composed of code derived from [NeXTSTEP](https://en.wikipedia.org/wiki/NeXTSTEP "NeXTSTEP"), [BSD](https://en.wikipedia.org/wiki/BSD "BSD"), [Mach](https://en.wikipedia.org/wiki/Mach_(kernel) "Mach (kernel)"), and other [free software](https://en.wikipedia.org/wiki/Free_software "Free software") projects' code, as well as code developed by Apple. \- [Darwin](<https://en.wikipedia.org/wiki/Darwin_(operating_system)>) on Wikipedia See also: [[MacOS]]