Postmodernism emerged in the late 20th century as a critique of modernism. It rejects the idea of grand narratives and absolute truths, instead embracing ambiguity and plurality of perspectives. Postmodern thinkers like Lyotard, Jameson, and Baudrillard analyzed how society has become dominated by images and media, lacking a clear sense of shared reality. While postmodernism highlighted diversity, it is criticized for being too pessimistic and for potentially undermining goals of modernity like democracy, freedom, and rational policymaking.