Voice-Over: Audio that is recorded [usually post-production] and plays over the scene, often used to tell a story/explain to the viewer what’s happening on screen without the character being shown on screen. It’s typically used in documentaries to ensure that the audience understands what’s happening on screen.

However, in films it can be a biased source of information where the character is telling the story from their perspective, purposely leaving out information from the story in order to get the viewer on their side. For example in Megamind, he tries to convince the viewers that he was wronged in order to justify his actions against Metro Man.