First and foremost, Linux is an operating system. An operating system is simply a collection of software that manages hardware resources and provides an environment where applications can run.

Linux. It's been around since the mid '90s, and has since reached a user-base that spans industries and continents. For those in the know, you understand that Linux is actually everywhere.

Linux is a Unix-like and generally POSIX-consistent PC working framework (OS) collected under the model of free and open-source programming improvement and dispersion.

Linux is a open source and community-developed operating system for computers, servers, mobile devices and embedded devices.

Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds