Postmodernism is a complex cultural phenomenon that emerged after World War II, characterized by its critique of societal conventions, consumerism, and grand narratives, while employing techniques like skepticism, irony, and fragmentation. It challenges traditional notions of identity, meaning, and the distinctions between reality and hyperreality, emphasizing the constructed nature of knowledge and authority. Notable theorists associated with postmodernism include Nietzsche, Derrida, and Foucault, who explore themes of loss, ambiguity, and the fluidity between the self and 'the other'.