Experimental film is a genre that has been around for decades. It involves the production of films that challenge the traditional narrative and visual structure of cinema. These films often push the boundaries of cinematic conventions, and as such, have a varied set of synonyms. Some of these include avant-garde film, art film, abstract film, non-narrative film, and underground film. These terms all connote the idea of cinema being used as a tool for artistic expression, rather than just for entertainment or storytelling. They are all different ways of describing films that are not afraid to push the limits of what is considered acceptable within the realm of cinema.