The document outlines the definition, significance, and criteria for the selection of essential medicines as defined by the World Health Organization (WHO), emphasizing their role in meeting healthcare needs and ensuring cost-effective treatment. It discusses the history and evolution of essential medicines lists, particularly in India, detailing the processes involved in their revision and the stakeholders responsible for their implementation. Furthermore, the document highlights the availability of these medicines in various sectors and the importance of educating healthcare providers and consumers about essential medicines.