What is Linux? Linux (pronouned with a short i) is a computer operating system. One of its advantages over Windows and Macintosh is that it is able to run on a wide variety of hardware. Other advantages include its cost, its freedom from viruses, and its flexibility. It's free!, the source code is available to any and all. This means that literally thousands of programmer-types have worked on this code with the result that there are few bugs to foul up the works. These same programmer types have also created a variety of software that is comparable to commercial software. And like the OS, the software is also free.