Linux is an open source operating system originally developed by Linus Torvalds in 1991. Since it is an open source operating system, the source code is freely available to everybody throughout the world over the Internet. This software has been developed under GNU General Public License and is considered as a revolutionary operating system in the world of computers.

The Kernel is the heart of Linux system, based on which Linux is developed. Linux is not only popular as freely available software, its functionality, adaptability and robustness is incredible. Technology giants like IBM, Hewlett-Packard etc. have embraced Linux as a versatile operating system for server platform. However, Linux is also becoming popular as home and office desktop operating system.

Linux is easily identified with its official mascot TUX, the Linux penguin.

Linux is packed with a number of advantages:
· Simply download it and start working along with instant GNU General Public License
· Doesn’t require to be rebooted for maintaining performance levels
· High performance on workstations and on networks, can handle a large number of users at a time
· Useful for high performance server applications, desktop applications and embedded systems
· Compatible with most of the file formats and all Unix packages

Linux is considered as the most secure operating system. Its flexible file access permission system and walls made it secure from any unwanted users.