What is Enigma?

Enigma is defined as a puzzling or inexplicable occurrence or situation: His disappearance is an enigma that has given rise to much speculation.

The term is used in media is what leaves the viewer wanting to know more and leaves them asking questions. Any good film opening will always have enigma and make the viewer want more.If enigma is not met then the opening of the film could feel like it has no role or feeling!