The importance of the question of “what is philosophy?” has been relatively overlooked, in comparison to many so-called big questions, such as “Who are we?”, “Where are we from?”, “Can we know anything?”, and so on; nonetheless, the wrong answers to this question by prominent philosophers in history have derailed the development of philosophy off the right track in different directions at different historical times. Although the elements offered in this article for the answer to “what is philosophy?” are by no means inclusive, they have differentiated themselves from all other famous existing theories concerning what philosophy is really about by directing the audience to the logical nature instead of historical knowledge of philosophy, and thus is truly qualified for the title of “Philosophy of Philosophy”.