Primary Health Centres (PHCs) were established in India to provide accessible and affordable primary healthcare according to the Alma Ata Declaration of 1978. PHCs are run by a Medical Officer with a MBBS degree and provide both diagnostic and outreach services. They are classified as Type A or Type B based on delivery load. PHCs aim to provide comprehensive primary care through services such as maternal and child health, family planning, immunization, treatment of endemic diseases, and referrals to higher-level facilities as needed. Staffing and infrastructure guidelines help PHCs achieve quality standards.