Postmodernism emerged in the mid-20th century as a reaction against modernism. It rejects objective reality and universal truths, embracing subjectivity and fragmentation. This movement challenges traditional hierarchies, blurs boundaries between high and low art, and uses irony and pastiche to critique dominant cultural narratives. Influenced by post-structuralism and deconstruction, postmodernism gained prominence in the 1960s and 1970s. It coincided with social movements, the rise of mass media, and new technologies. Postmodern art and literature employ techniques like appropriation, non-linear narratives, and metafiction to explore identity, language, and the nature of reality.