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The Media Rating Council, commonly known as MRC, is a not-for-profit industry self-regulatory body that audits and accredits media measurement services across the United States. Established in 1963 at the request of US Congress, the organization was created to give advertisers, agencies, publishers, and measurement providers a trusted framework for evaluating how media audiences are counted. Its work centers on MRC media measurement standards, independent audits, and accreditation processes that help ensure reporting is accurate, consistent, and defensible. The website presents information about the council’s mission, accreditation process, and the standards used to evaluate measurement services. The rating council serves a broad range of stakeholders in the advertising ecosystem, including brands, agencies, publishers, platforms, data firms, and measurement vendors. By defining criteria media measurement providers must meet, the MRC supports transparency in how audience metrics are produced and reported. It reviews methodologies, data practices, governance, and disclosure standards, then provides an audit-based assessment that can give buyers confidence in the numbers behind media planning, buying, and performance evaluation. What makes the MRC notable is its long history and independent role in a market where measurement choices can directly affect budgets and business decisions. The organization does not sell advertising or take sides in commercial disputes; instead, it focuses on maintaining standards that help secure media investment and support fair comparisons across channels. As media measurement becomes more complex, the MRC’s audit and accreditation work remains relevant to anyone who relies on media rating data, audience counts, or performance metrics to make informed decisions.