""Lip Synch"" redirects here. For the American musical comedy television program, see Lip Sync Battle. For the film series, see Lip Synch (series). For other uses, Lip Sync (disambiguation)Lip sync, lip-sync, lip-synch (short for lip synchronization) is a technical term for matching lip movements with pre-recorded sung or spoken vocals that the listeners hear through speakers, either through PA system speakers in a ""live"" performance or television or cinema speakers in the case of a lip-synced TV show or film performance. The term can refer to any of a number of different techniques and processes, in the context of live performances and recordings.In the case of live concert performances, lip-synching is done by some singers to ensure that the vocal performance will sound as good as the CD, but it can be considered controversial, especially if the audience believes that they are viewing a live singing performance. In film production, lip synching is often part of the post-production phase. Dubbing foreign-language films and making animated characters appear to speak both require elaborate lip-synching. Many video games make extensive use of lip-synced sound files to create an immersive environment.