OK. You've heard of Linux. It's another operating system for a computer. But why use it when you can choose between Windows and Macs? Unless you run business-class servers, Linux isn't really something consumers really need to hear about, right? Well, if that's what you think Linux is, you couldn't be further from the truth. Look around you. Linux is everywhere, but you may not know it. However, you'll have to look at the fine print to be sure, because manufacturers usually don't openly advertise with labels announcing "Linux Inside."