I have known about OS X's "Single Application Mode" for a long time, but a new feature in Mavericks has me testing it out again. According to an article on TidBITS, Single-Application Mode was introduced in 1999 with the (then) new Finder in Mac OS X. "Single-Application Mode" meant that when you switched from one app to another using the Dock then the new application that you had selected would come to the front, and the other applications would automatically hide. According to the TidBITS article, this was initially intended as the default behavior for the Finder, but public reception was so bad that so Apple dropped it as the default. However, the feature has continued to exist ever since.
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