Compiz? Emerald? Metacity? What’s the Difference?

“The three most common window managers in the Ubuntu world are
Metacity, Compiz, and Kwin. Yes, there are others, such as
Enlightenment, Fluxbox, Xmonad, and Ion, but I’m not going to go
into why each of them rocks. Metacity is the default GNOME window
manager. Kwin is the KDE window manager. And then there’s Compiz.
Compiz is the compositing window manager that is enabled in Ubuntu
by default if your system can handle it. The function of the window
manager is to draw the windows in a certain place, with a certain
size, and let them be movable and resizable.

“Then you have the window decorator. This is where people get
tripped up.”

Complete Story