A very stable operating system that was created as an experiment by Linus Benedict Torvalds. He created it because he wanted to learn the inner workings of an operating system. He posted the code on the Internet for others to modify and share, and it spread like wildfire. It grew and grew and is growing every day. Although it is not as simple to use as Windows or Mac OS, it does have rock solid stability and is not uncommon to hear of systems running for many years without reboots. Many people who hate it do it to act cool, or because they dont understand it. Those who love it, love it because they understand that it may take a little while to get something working. Not those other impatient little bastards who want everyday on the double. It just needs time to get more user friendly.
Linux outperforms Windows in terms of stability.