What is Linux?

Linux is an operating system (OS) developed by Linus Torvalds at the University of Helsinki in Finland. Linus released his source code under GNU General Public License (GNU GPL). The source code can be freely modified and redistributed commercially and non-commercially by anyone under the GNU GPL. Then what is an OS and how it works? So many questions, huh... When you turned on your computer, the processor will trigger the Basic Input Output System (BIOS), the BIOS will then look for the the boot device (it can be your CD/DVD, floppy disk, flash drive, but mostly hard disk). An OS must be in the boot device and when it loads you can see that the computer opens. In simple terms, OS is the one that will make your computer open. This statement however underestimates OS, and unacceptable in real sense. I recommend the following articles for more information: (a) Operating system (b) Windows Bootup Process