What is the difference between a data owner, data custodian, and data steward?

The data owner is typically a senior manager who has ultimate responsibility for the data, sets classification levels, defines access policies, and ensures compliance with regulations. The data custodian is typically an IT professional who implements and maintains the technical controls that protect the data, including backups, access controls, and encryption. The data steward ensures data quality, accuracy, and appropriate use within business processes.