Final answer:
Postmodernism is a philosophical theory that rejects absolute truth and emphasizes the role of power relations, language, and motivations. It has influenced various fields and challenges the notion that cultures can be completely or accurately described.
Step-by-step explanation:
Postmodernism is a philosophical theory that emerged in the late 20th century. It rejects the idea of absolute truth and emphasizes the role of power relations, language, and motivations in shaping ideas and beliefs. Postmodernists believe that cultural understanding is subjective and influenced by the biases of observers, and therefore, cultures can never be completely or accurately described. This theory has had an impact on various fields, including literature, art, philosophy, economics, and architecture.