What is Philosophy?

Philosophy begins with questions and, as such, a good place to start is with this often overlooked question concerning the nature of philosophy itself.  Strangely, for a discipline that places such great emphasis on defining and clarifying concepts, there is no unanimously agreed definition of what exactly philosophy is.  The term ‘philosophy’ in its literal sense means ‘love of wisdom’ and we know that there have been, throughout history, a great many men [sorry ladies] that we call philosophers who have written ‘philosophical’ works on a wide variety of subjects.  Perhaps then, we could just say that philosophy is the collected works of all of these philosophers.  However, this doesn’t really enlighten us as to what it is that all of these thinkers and works have in common; what is it that means that we categorize them as ‘philosophical’ rather than scientific, religious, historical, or whatever?