The document discusses various ways of defining art and theories about art. It outlines three approaches to defining art: 1) clear-cut definitions that classify what is and isn't art, 2) skepticism about being able to define art, and 3) a contextual approach focusing on art's changing social role over time in different contexts. It also summarizes several key theories of art, including imitation theory, intentionality thesis, communication theory, institutional theory, and Duchamp's concept of 'readymades' which argues an object becomes art through an artist's intentions.