" With the release of KDE 4 a new feature was added that, at
first, seemed to be more confusing than anything else. Although the
theory behind the idea was simple, the execution made the idea
overly complex. The idea was this: You break the desktop up into
activities so each desktop is very well defined by what that
desktop does. You could have one desktop for writing, one desktop
for programming, one desktop for entertainment.
"This seemed like a redundancy in Linux, what with the existence
of the pager and all. But as KDE grew a bit older and wiser, the
usage of this feature become more and more clear. Now, in this
Ghacks article I am going to help you to understand exactly why
this feature is something you will certainly want to use to keep
your desktop as organized as possible."