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Spoken word is not limited to radio commercials and books on tape. When films, videos and TV shows (etc) are created, a sound engineer will record the dialog and sounds that are occurring on the set.  Very often, that sound will be replaced afterwards in POST-PRODUCTION. 

Dialog is replaced in an OVERDUB or VOICEOVER session.  The actor watches the original film clip and re-creates the dialog under more controlled conditions (less ambient noise, etc).  Sometimes the original dialog is changed (into another language or even “cleaned” for public broadcast). 

This work will usually take place in a Voiceover Studio, which is a small facility with only vocal booths for recording narrations, announcements, audio books, automated messages, etc.