Postmodernism is a broad term used to describe movements across various fields such as art, philosophy, culture, and music. There is no single definition, as it questions established knowledge and beliefs. Postmodernists like to challenge audiences and societal norms. The term was first used in the 1870s in relation to painting styles, and was later applied to changes in religion and new forms of art and music that rejected modern architecture. Jean-Francois Lyotard analyzed postmodernity's impact on identity and culture, arguing that television has altered people's attention spans and consumerism now defines identity. Postmodern art blends high and low forms, historical styles with modern elements like fashion in a way that rejects boundaries.