Voice-over is a production technique where a voice that is not part of the narrative and is used in radio, television production, film making, theatre, or other presentations. The voice-over is read from a script and may be spoken by someone who appears elsewhere in the production or by a specialist voice talent. Synchronous dialogue, where the voice-over is narrating the action that is taking place at the same time, remains the most common technique in voice-overs. Asynchronous, however, is also used in cinema. It is usually pre-recorded and placed over the top of a film or video and commonly used in documentaries or news reports to explain information. Voiceover is used in video games and on-hold messages, as well as for announcements and information at events and tourist destinations. It may also be read live for events such as award presentations.