What is a "voice-over" in video production?

A voice-over in video production refers to a narration that is recorded separately from the live action. It is typically used to provide additional context, convey a character's thoughts, or guide the audience through the story. This narration can be added in post-production, allowing for greater flexibility and enhancing the storytelling aspect of the video.

This technique is essential because it enables the creators to deliver specific information or emotional nuances that might not be effectively communicated through visuals alone. For instance, a documentary might use a voice-over to explain complex concepts or provide background information while showing related footage.

The other options do not correctly define a voice-over. Visual elements pertain to the imagery seen on screen; live sound effects occur during the filming process; and background music is used to set the tone but does not involve spoken narration. Understanding the concept of a voice-over is crucial for video production as it enhances the narrative and engages viewers more effectively.