OATER is a term used to describe a type of film genre. It is an abbreviation for 'Old West Film' or 'WESTERN'. OATERs are also known as 'Horseoperas' and 'Westernmovies'. These films typically feature stories set in the American Old West, with characters such as cowboys, gunslingers, and lawmen. They often include themes of justice, morality, and loyalty. OATERs have been popular since the early 20th century and remain a beloved genre today.