When it comes to using GNU/Linux, there are two well-known desktop environments - GNOME and KDE. Most users opt for one or the other and make do with their choice.
Both GNOME and KDE are environments that are full of features and, hence, quite memory-hungry. For most people, given the configurations which are present on modern-day PCs or laptops, that is not a problem.
But for others, who have older machines, it is a very real problem.
Here is where a desktop like the Lightweight X11 Desktop Environment comes in. It is not half as well-known as KDE or GNOME but an excellent substitute.
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