Aesthetics is a branch of philosophy. It is the study of art and beauty. Together with ethics it is part of axiology which is the philosophy of what people like. Aesthetic philosophers ask what people like to see, hear, feel, smell or taste, and why they like these things. Aesthetic philosophers also ask if art has any value. For example, they may ask if some art that nobody likes and that nobody wants is art at all or if it is something else. Plato, Aristotle, and Immanuel Kant are some important philosophers of aesthetics.