Simple Harry. If you read through the weki, you would learn that it is faster, easier to use and supported by many companies like Oracle and free. Linux doesn't know what an executable file is, so no hijacks, worms virus's etc. I had my computer hijacked 3 times a year and a half ago by Eastern Euro's and there phony virus software. I got it once from downloading a video of Jay Leno's Model T. Once you use Linux, you won't go back to windoz. If I need to run a windoz program in Linux, Oracle makes a free virtual windows add on program that runs inside Linux to do that. I find that there are very few equivalent programs that aren't available in Linux. It runs on a regular pc. If you really want to know why I use it, ask yourself why you use a Mac. Because it's better. So now you know Harry. There is another operating system for a pc. It installs as easy or easier than window and in my opinion, is much better. Go here and learn what it is and see why I use it. http://www.ubuntu.com/ubuntu/why-use-ubuntu. You can't learn why until you know what it is.