This document provides an overview of single-payer health care systems around the world. It defines key terms and describes examples of single-payer systems, including those in Canada, the UK, Norway, and Germany. These systems vary in their financing models but all aim to provide universal coverage through a public or quasi-public single payer. Outcomes like health spending, wait times, and access are compared. The document also discusses Vermont's initiative to establish a single-payer system called Green Mountain Care.