"Voiceover narration" refers to a technique in storytelling where a person's voice, who is not present on-screen, provides a commentary or explanation of the events happening in a movie, TV show, or documentary. Full definition
That's because, as he says in voiceover narration, «I found a book about teenage paranoid delusions during a routine search of my parents» bedroom.» (salon.com)
Very little is revealed about Rick and that which is comes courtesy of voiceover narration from one tertiary character or another as they reflect on their experiences with him. (silverscreenriot.com)
The film opens pleasantly enough, with voiceover narration by Emma Thompson accompanying an image of the Voyager I spacecraft, the furthest man - made object from earth, hurtling toward the edge of the solar system. (waytooindie.com)