The Iron Age in Britain lasted from around 800 BC to the Roman invasion in AD 43. During this period, people began to use iron tools and weapons, which improved agriculture and warfare. Settlements grew, and communities became more complex, often organized into tribes. The era is marked by the construction of hill forts and roundhouses, which provided protection and shelter. The Celtic culture flourished, characterized by distinctive art, pottery, and metalwork. Trade networks expanded, connecting Britain with other regions, and the introduction of coinage facilitated commerce.