Healthcare systems are complex networks of organizations, people, and resources that work together to provide health services. This unit introduces the key components, stakeholders, and models of healthcare systems worldwide, examining their strengths, weaknesses, and impact on care delivery. The unit explores historical context, current challenges like rising costs and workforce shortages, and future trends such as personalized medicine and digital health. It also addresses ethical considerations in healthcare system design and highlights practical applications of this knowledge for professionals in the field.