KDE

The K Desktop Environment, better known as KDE, was initially called, in 1996, "the Kool Desktop Environment".

KDE is a powerful Open Source graphical desktop environment for Linux and Unix workstations. It combines ease of use and outstanding graphical design with the technological superiority of the Unix operating system. KDE and GNOME are the most widely used desktop environments on Unix operating systems.

KDE's office suite is KOffice.

KDE applications generally use the Qt toolkit for their GUI.

How to get KDE
If you want to install KDE on your computer, you first need to find out your distribution. Then proceed accordingly.

Ubuntu
To install KDE on Ubuntu, open a conSole and enter sudo apt-get install kubuntu-desktop

Debian
Install KDE on Debian, you could use apt-get install aptitude tasksel aptitude --without-recommends install ~t^standard$ ~t^desktop$ ~t^kde-desktop$

Latest major release
The latest major release of the K Desktop Environment is KDE Plasma 6.