A world's fair, also known as a universal exhibition or an expo, is a large global exhibition designed to showcase the achievements of nations. These exhibitions vary in character and are held in different parts of the world at a specific site for a period of time, typically between three and six months.

Expo 2017 Astana was an International Exposition which took place from June 10 to September 10, 2017 in Astana, Kazakhstan. The expo's theme was "Future Energy", and aimed to create a global debate between countries, nongovernmental organizations, companies and the general public on the crucial question: "How do we ensure safe and sustainable access to energy for all while reducing CO2 emissions?"