There is no consensus among professional philosophers about the answer to that question, or even how to go about answering it. This gives us a clue to one of the distinctive features of Philosophy, namely, that in Philosophy, absolutely everything is open to question. But philosophers don’t just raise questions; they also attempt to answer them, no matter how difficult those questions are. Some of the questions you might address as a student of Philosophy include: What makes an action like lying right or wrong? Do we have duties to non-human animals? Are there any moral truths? What exactly is knowledge, and do we have any? What makes you a person? Is time travel possible? Is your mind something over and above the activity of your brain? What kind of thing is a number? What makes a work of art beautiful?
Philosophy at Oxford is studied only in combination with other subjects. Applicants can choose between: Mathematics & Philosophy; Physics & Philosophy; Philosophy & Modern Languages; Philosophy, Politics, & Economics; and Philosophy, Psychology, and Linguistics.