A CoE improves data governance and quality by establishing and enforcing comprehensive data governance frameworks that include policies, standards, and best practices for data management. This includes defining data ownership, ensuring data accuracy, completeness, and consistency, and implementing data security measures to protect sensitive information. Regular audits and monitoring are conducted to maintain high data quality. Additionally, the CoE promotes a culture of accountability and responsibility for data management across the organization, ensuring that data is used ethically and in compliance with regulations.