“Disparities in health and health care in the United States have been a longstanding challenge resulting in some groups receiving less and lower quality health care than others and experiencing poorer health outcomes. This brief provides an introductory overview of health and health care disparities, including what disparities are and why they matter, the status of disparities today, and key efforts to address disparities, including provisions in the Affordable Care Act (ACA) and their impact on health coverage disparities.”