All media are constructions. All media construct reality. Audiences negotiate meaning in media. Media have commercial implications. Media contain ideological and value messages.
Media have social and political implications.
Media have unique aesthetic forms that are closely related to content. The filmmaker takes originally fragmented and unrelated images and events and creates new meanings from them. The dimension of time is falsified. Editing involves selection, omission, and compression of a wide range of material. The narrative, theme or aesthetic logic doesn't usually match the original events.