Karl Mannheim was a Hungarian sociologist born in 1893, known for his contributions to the sociology of knowledge. He explored how social factors influence people's ideas and beliefs, emphasizing that knowledge is shaped by the social context in which it arises. His work laid the foundation for understanding the relationship between society and thought. Mannheim is best known for his concept of ideology and utopia, which distinguishes between different types of thought. He argued that ideologies are the perspectives of specific social groups, while utopias represent broader visions for society's future. His ideas have influenced various fields, including sociology, political science, and philosophy.