A Health Maintenance Organization (HMO) is a type of health insurance plan that provides a range of medical services through a network of providers. Members typically pay a monthly premium and are required to choose a primary care physician (PCP) who coordinates their healthcare needs. This model emphasizes preventive care and often requires referrals for specialist services. HMOs aim to reduce healthcare costs while ensuring that members receive necessary medical attention. By focusing on preventive care and managing patient care through a network of providers, HMOs help maintain the overall health of their members, ultimately leading to better health outcomes and lower expenses.