Answer
Postmodernism, articulated in the field of philosophy by Jean-François Lyotard, challenges the grand narratives and universal truths that characterized modern thought. It emphasizes the fragmentation of knowledge, the relativity of truth, and the importance of difference and diversity. Lyotard's work, particularly his seminal text "The Postmodern Condition", critiques the metanarratives that have shaped Western thought and argues for the recognition of multiple, local narratives.