This document discusses different models of healthcare systems around the world. It describes four main models: the Bismarck model used in Germany and other countries, where private insurance plans are regulated by the government; the Beveridge model used in the UK with government-provided and tax-funded healthcare; the National Health Insurance model used in Canada with a universal government-run insurance program; and the out-of-pocket model used in many developing countries where most cannot afford medical care. The document then examines the healthcare systems of several countries in more depth and discusses challenges facing Nepal's system.