What is a short film?
A short film is a film which is not longer than a feature film. A film
which can be up to 40 minutes or less including titles and credits.
Short films can be produced by both professionals and amateurs, they are
often screened at film festivals, and short films are often made on low budget
as a way of show casing new talent for future work.
Feature and short films differ not just in lengths, in a short film
there is not much exposure to key characters and a fully developed
introduction, also there will be fewer characters starring in the film.
Moreover, the locations and settings will be limited therefore there will heavy
reliance on acting and the visual effects.
Other kinds of films are:
Biopic- a film based on the
events of someone's lifeDocumentary- a film or television programme that deals with real people and events Feature
film- a film of standard length
Overall a short film can be anything shorter than 40 minutes and does not necessarily have to be produced by professional practitioners.
Source: Future Learn