Zygmunt Bauman was a Polish sociologist and philosopher, best known for his work on modernity and postmodernity. He introduced the concept of "liquid modernity," which describes the fluid and changing nature of contemporary life, where social structures and relationships are less stable than in the past. His ideas have influenced various fields, including sociology, cultural studies, and political theory. Bauman's writings often explore themes such as consumerism, globalization, and the impact of technology on society. He was also known for his critiques of modernity and the challenges it poses to individual identity and community. His work has been widely discussed in relation to globalization and social change.