Linux: Definition and additional resources from ZDNet
Linux, is a multitasking, multiuser operating system that is know for its stability.
A very popular open source operating system that runs on a variety of hardware platforms including x86, Itanium, PowerPC, ARM and IBM's entire product line.
Based on many design principles used in the Unix operating system, and thereby often called a "Unix clone" or "Unix variant," Linux is widely deployed as a server OS and as an embedded OS.
For example, Linux runs in most of the servers on the Internet and in countless appliances and consumer electronics devices (see embedded Linux).
In the desktop market, Linux has nowhere near the same penetration; however, it gains ground slowly and steadily.