The Doomsday Book is a comprehensive survey of England completed in 1086, commissioned by William the Conqueror. It aimed to assess landholdings and resources for taxation purposes after the Norman Conquest. The book provides detailed records of towns, villages, and their inhabitants, making it a crucial historical document. The Doomsday Book contains information about land ownership, agricultural production, and the value of properties. It is considered one of the first examples of a national census and offers insights into medieval society, economy, and governance in England. Its name reflects the finality of the assessments made during that time.