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The term voice-over refers to a production technique where a
non-diegetic voice is broadcast live or pre-recorded in
radio,
television,
film,
theatre and/or
presentation.
The voice-over may be spoken by someone who also appears
on-screen in other segments or it may be performed by a
specialist
voice actor. Voice-over is also commonly referred to as "off
camera" commentary.
The term voice-over can also refer to the actual voice actor who performed the recording. The terms voice actor, narrator, voice artist, announcer are all similarly used.