Linux: is a Unix-like, open source (non-proprietary) computer operating system (OS) used by servers, mainframes, mobile devices and embedded devices. Linux implements the core ('kernel') of the unix OS and it is supported on almost every major computer platform including x86, ARM and SPARC, making it one of the most widely supported operating systems. Reported to be the fastest growing OS on servers, and the one with the lowest total cost of ownership (TCO), it is in public domain and may be downloaded free of charge from several websites.There are a lot of variations of Linux software such as Ubuntu, Linux Mint, Arch Linux, Deepin, Fedora, Debian, openSUSE, etc.