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Maintaining data quality rules and stewardship for critical data is the responsibility of the data steward. This role owns data governance and quality standards, defining what good data looks like and enforcing those definitions across systems. They create and maintain data quality rules—such as mandatory fields, allowed value sets, and referential integrity—and monitor results, coordinate remediation, and ensure stakeholders agree on data definitions and usage. Because critical data must remain accurate, complete, consistent, and trustworthy, the data steward serves as the primary custodian, collaborating with data owners and data users to sustain data quality over time. The other roles mentioned have different primary focuses: an IT security analyst concentrates on protecting data and systems from threats; a sales representative focuses on customer-facing business activities; legal counsel provides legal guidance and compliance considerations but not day-to-day data quality governance.