Linux is not Operating System (OS), it is a family of open source unix like operating system based on the linux kernel.

 

Mr. Linus Torvalds, first introduced OS kernel on 17^th Sept. 1991. Mr. Linus Torvalds had a penguin named TUX, on his name the OS kernel is known as LINUX (LINus + tUX).

 

Some of the popular distributions are Debian, Fedora & Ubuntu. RHEL & SUSE are come under commercial distributions.

 

Initially Linux developed for personal computers based on Intel x86 architecture. Most of the websites are hosted with Linux Kernel and day by day the popularity of LINUX Kernel is increasing.