The GNU Project and GNU/Linux

The GNU Project was launched in 1984 to develop a complete Unix-like operating system which is free software: the GNU system. (GNU is a recursive acronym for ‘GNU’s Not Unix’; it is pronounced ‘guh-NEW’.) Variants of the GNU operating system, which use the kernel Linux, are now widely used; though these systems are often referred to as ‘Linux’, they are more accurately called GNU/Linux systems.

For more information, see: https://www.gnu.org/ and https://www.gnu.org/gnu/linux-and-gnu.html.