A health system consists of all people, institutions, resources, and activities whose primary purpose is to promote, restore, and maintain health. Health System Strengthening comprises the strategies, responses, and activities that are designed to sustainably improve country health system performance. USAID invests in health system strengthening because strong health systems underpin all other health investments and lead to greater resilience and global health security. Strong health systems are necessary for all people to achieve access to quality health care, and to align resources for achieving sustainable improvements in health and for countries’ economic growth. This work helps USAID reach our three priority global health goals of Preventing Child and Maternal Deaths, Controlling the HIV/AIDS Epidemic, and Combating Infectious Disease, which directly contributes to the Global Health Security Agenda. Learn more about our approach to strengthen health systems through our Vision for Health System Strengthening 2030 and how our work supports more sustainable and robust results.