Overview:

Linux is that the well-known and most-used open source OS. As an OS, Linux is software which sits underneath all the other software on a computer, receiving requests from those programs and relaying these requests to the hardware.

Linux is a very well-known Operating System used in server, desktop and mobile computing. Linux platform is that the first option to host Database, Email, Applications and Web. Most of the planet class companies are running on Linux like Google, Facebook, Wikipedia, Yahoo, Amazon etc...