Aesthetics, also called esthetics, is a branch of philosophy that relates to the nature and appreciation of art, taste, and beauty. It covers both the objective and subjective aspects of these topics, with a focus on the psychological responses that they evoke in viewers or listeners. Aesthetics covers a wide range of topics, from the philosophy of art to the sociology of taste. Some common topics of discussion include the definition of art, the relationship between art and emotion, the role of imagination in art appreciation, and others.