Linux is a freely distributed, UNIX-compatible operating system originally created for PCs. It has since been adapted to run on various types of processors. The name 'Linux' is a trademark registered to its creator, Linus Torvalds, and is often interpreted as Linus's UNIX.
A codename for the Navigator Web browser created by the Netscape Communications Corporation, Mozilla evolved to become the Mozilla Application Suite, and is now known for publishing open-source applications such as Firefox and Thunderbird.
