As of April 2011, Linux is about 20 years old from its inception in 1991. Linux is free and open source operating system developed by Linus Torvalds. Minix is the inspiration’s of Linux. Minix is developed by Andrew S. Tanenbaum purposely for education. There a long debate between Tanenbaum and Torvalds on their architecture to design their operating system. Minix is using Microkernel while Linux is using Monolithic Kernel. Because Linus Torvalds decides to push Linux source code under GNU General Public License, finally, Linux gets outstanding success by having a lot of contribution from kernel developers around the globe.