This document provides an introduction to energy efficiency. It discusses rising global energy consumption and temperature trends. Various sectors contribute to energy usage, including industry, transportation, residential, and commercial. Developing countries' energy usage is growing rapidly. The International Partnership for Energy Efficiency Cooperation (IPEEC) is presented as a forum that facilitates cooperation and information sharing around energy efficiency best practices between countries. Key opportunities for improving energy efficiency are highlighted in sectors like industry, buildings, transportation, and power. Specific policies and programs from countries like the US, Japan, and China that have successfully increased energy efficiency through standards, labels, incentives are outlined. Benefits of greater energy efficiency include reduced emissions and costs, improved energy security, access,