elementary OS is a Linux distribution based on Ubuntu. It makes use of a desktop with its own shell named Pantheon and is deeply integrated with other elementary OS applications like Plank (a dock), Midori (the default web browser) and Scratch (a simple text editor). This distribution uses Gala as its window manager, which is based on Mutter.The distribution initially started as a set of themes and applications designed for Ubuntu which later turned into its own Linux distribution.