Procurement plays a central role in the economic functioning of modern societies. It represents the process by which public and private entities acquire goods, services and works required for their operations. It is crucial to ensuring transparency, efficiency and fair competition in economic transactions. Whether at national or international level, the way in which contracts are awarded can have a significant impact on economic development, social justice and governance. The aim of this book is to serve as a reference and guide to understanding the complex mechanisms of procurement, and the associated issues and practices, both nationally and internationally.