Why was the domesday do ok useful to William why is useful today?

The Domesday Book was useful to William the Conqueror as it provided a comprehensive survey of landholdings and resources in England, enabling him to assess taxes, manage land disputes, and consolidate his control over the newly conquered territory. Today, it serves as a vital historical document, offering insights into medieval society, economy, and land ownership, and is a key resource for historians studying the transition from Anglo-Saxon to Norman rule.