Philosophy is a unique sort of activity that involves the analysis of concepts and the justification of beliefs. To analyze a concept is to determine what it means. In order to experience and communicate about the world we must employ concepts. But the concepts we employ in ordinary life are often vague and ambiguous. One activity of philosophy is to pass from those obvious, vague and ambiguous concepts whose meaning we are unsure of, to something definite, clear and precise which upon reflection and analysis we find to underlie them.
Philosophy seeks to answer that question.
There are many different areas of philosophy which can to some extent be delineated through a consideration of the concepts they analyze and questions they attempt to answer. Ethics is concerned with what we ought to do and what is good for us. Logic studies the differences between valid and invalid reasoning. It provides techniques for developing proofs, and critically analyzing various points of view. Although this question might sound paradoxical, it actually has a surprising answer.