This paper claims that what philosophy primarily does is interpret our notions, offer ways of understanding these notions that are not scientific in nature but not contrary to science either. The paper draws a distinction between conceptual analysis, a highly constrained enterprise that is supposed to bring to light what was in the concept all along, and the interpretation of notions, a creative enterprise that offers ways of understanding notions that were not already prefigured by the content of these notions—philosophy (...) consists in the latter, not the former. It explains how these interpretations are justified and what the difference is between better and worse interpretations. The remainder of the paper is organized around three headings: philosophy and science, philosophy and language, and philosophy and progress. It claims that in philosophy there is no real progress, but that philosophy does move forward because the notions at issue are endlessly interpretable. (shrink)