Philosophers love to argue about that.
Philosophy has been defined as the love of wisdom, the critical examination of ideas about ourselves and the world, the search for truth through reasoning, the quest for the foundations for our basic beliefs, as well as a discipline which comprises metaphysics, logic, ethics, epistemology, and aesthetics. Such definitions have their uses, of course. But you'll only discover what philosophy really is by studying and doing it. In philosophy courses, you'll get to respond to those questions, and many others. In addition to engaging the great philosophers, you'll get intellectual survival skills.