Modernism emerged between the 1890s-1960s as an artistic and social movement that rejected realism in favor of experimental styles. Postmodernism began in the 1970s as a rejection of the distinctions and boundaries that defined modernism, embracing styles like parody, pastiche, and bricolage that blended genres and mixed fiction with reality. Key aspects of postmodernism include intertextuality, questioning binary divides, and emphasizing style over content through techniques like sampling to create a hyperreal version of mediated reality.