What is the difference between GNOME, KDE, XFCE, and LXDE?

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http://linux-news.org – In Linux, there are so many choices, and this includes the desktop environments and window managers. Four of the most popular desktop environments in Linux are GNOME, KDE, XFCE, and LXDE. All four offer sophisticated point-and-click graphical user interfaces (GUI) which are on par with the desktop environments found in Windows and Mac OS X. When you ask different people which of these four is best, you will likely get many different answers. So which is the best between GNOME, KDE, XFCE, and LXDE? (Resources)