From Wikipedia, the free encyclopedia
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. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word “Linux” in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
Community icon by Alpár-Etele Méder, licensed under CC BY 3.0
As in Linux and most Unix(like) operating systems, the graphical interface is not the default way to interact with the operating system, contrary to what happens in Windows and OS X, there are many “desktop environments”. Desktop environments are a cohesive collection of graphical applications to interact with the operating system and GNOME is one of them, alongside KDE and XFCE, which are the most famous ones (but there are a lot more).
This is GNOME:
This is KDE:
This is XFCE: