narrator

Narration is the use of a written or spoken commentary to convey a story to an audience. Narration is conveyed by a narrator: a specific person, or unspecified literary voice, developed by the creator of the story to deliver information to the audience, particularly about the plot: the series of events. Narration is a required element of all written stories, presenting the story in its entirety. It is optional in most other storytelling formats, such as films, plays, television shows and video games, in which the story can be conveyed through other means, like dialogue between characters or visual action. Read more on Wikipedia