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An auto show, also known as a motor show or car show, is a public exhibition of current automobile models, debuts, concept cars, or out-of-production classics. It is attended by automotive industry representatives, dealers, auto journalists and car enthusiasts. Most auto shows occur once or twice a year. They are important to car manufacturers and local dealers as a public relations exercise, as they advertise new products and promote auto brands. The five most prestigious auto shows, sometimes called the "Big Five", are generally considered to be held in Frankfurt, Geneva, Detroit, Paris and Tokyo. 
There are other auto/car shows that occur on a more frequent basis, almost weekly. It is not known if there is a regularly accepted term for these more frequent, informal "car rallies" or "car enthusiasts events". Some meeting events have themes, such as classic cars, hot rods, etc. These events are more localized, typically consisting of car enthusiasts who meet to socialize and enjoy their enthusiasm with other car owners.
The Organisation Internationale des Constructeurs d'Automobiles organizes many auto shows.
They are distinguishable from car shows in that auto shows typically showcase new or concept vehicles whereas car shows showcase custom, classic, or exotic cars. They also distinguish in that auto shows are almost always a major professional event whereas car shows can be either professional or amateur and many are locally organized. Auto shows always charge for admission whereas many cities have local, free car shows.
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