GNOME-Shell, is probably the most well-known DE available and is a GTK-based desktop environment.
Use of the tag
Use it when asking about the the Desktop Environment GNOME as whole, how to run non-native gnome applications in GNOME, general configuration and behavior change.
If you want to ask about nautilus or some other GNOME application, use that as tag instead.
Automatic Workspace management
At any given moment, it only keeps open as many workspaces as you have active windows on, plus an extra empty one to start more windows. When you remove all the windows from a workspace, that workspace will be removed until you need it again.
An unique features to GNOME Shell's and it functionality and interface can be extended or modified through the use of extensions. For more information on how to install these extensions, see How to install GNOME Shell extensions.
It provide a uniform interface for messages, notifications, and alerts. Allow the user to stay focused on the primary task and have controllable information display. It also provide a lightweight interface to background operations.
┃ │ Required │ Recommended ┃
┃ Processor │ 1 GHz (x86) │ Better than 1 GHz (x86)┃
┃ Memory │ 768 MB │ 1 GB ┃
┃ Hard drive capacity │ 7 GB │ 10 GB ┃
┃ Video card │ VGA @ 640×480 │ VGA @ 1024×768 ┃
How to install
But it is recommended to install it from the official image (.iso) that can be downloaded at this page.