Postmodernism is difficult to define but can be characterized by six key concepts: the death of grand narratives like religion or philosophy that structured society, metafiction where works are self-reflexively aware of their status as texts, intertextuality where works reference other works rather than reality, hybridity as works incorporate different genres and styles, fragmentarism as narratives lack clear structure, and the dissolution of personal identity. Postmodernism emerged in the late 20th century after disillusionment from World War 2 and the 1960s, and is seen in cultural artifacts beyond just philosophy, including popular music videos.