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A world's fair or world fair is a large international exhibition designed to showcase 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, ranging usually from three to six months.
The term "world's fair" is typically used in the United States. In French the term Exposition universelle ('universal exhibition') is used; in other Romance languages such as Spanish, Italian, and Romanian, the translation of the French term is used. In the non-Romance languages of Europe, and in Asia and the Middle East, World Expo or Specialised Expo are commonly used. The short term Expo has been applied to both types of Expos in various locations since 1967.
Since the 1928 Convention Relating to International Exhibitions came into force, the BIE has served as an international sanctioning body for international exhibitions. Four types of international exhibition are organised under the auspices of the BIE: World Expos, Specialised Expos, Horticultural Expos (regulated by the International Association of Horticultural Producers) and the Milan Triennial. Depending on their category, international exhibitions may last from three weeks to six months.
Milan, Italy, held the most recent World Expo in 2015, while Nur-Sultan, Kazakhstan, held the most recent Specialised Expo in 2017. Dubai, United Arab Emirates, was selected to host Expo 2020, but due to the COVID-19 pandemic it was postponed to 2021. Buenos Aires, Argentina, who had been selected to host the next Specialised Expo in 2023, announced its withdrawal with no reschedule date.