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An exhibition is an organized event in which a collection of special objects can be viewed by the public. The objects are often brought together from many places for the period of the exhibition. The objects on show are called exhibits.
Museums often organize special exhibitions, such as paintings by a famous painter. These paintings will mostly be “on loan”, i.e. specially borrowed from other museums. Exhibitions can be about anything. They may be to do with art, or they can also be science exhibitions.
Some exhibitions show things which can be bought. Firms exhibit the things they have made, hoping to encourage business. These exhibitions are called trade fairs. They are sometimes called expositions or expos. They may be open to the public, but others are just for invited business people.