Lip sync or lip synch, short for lip synchronization, is a technical term for matching a speaking or singing person's lip movements with sung or spoken vocals.
An audio engineer (foreground) recording a voice actor (at microphone) for an animated video production. Lip synchronization of this recording with animation will give the impression that an animated character is speaking.
Pop singer Ashlee Simpson (pictured in 2009) lip synced a song on the variety TV show Saturday Night Live in 2004.
Milli Vanilli in 1990
Spears performing in 2009's world tour The Circus Starring Britney Spears
Singing is the act of creating musical sounds with the voice. A person whose profession is singing is called a singer, artist or vocalist. Singers perform music that can be sung with or without accompaniment by musical instruments. Singing is often done in an ensemble of musicians, such as a choir. Singers may perform as soloists or accompanied by anything from a single instrument up to a symphony orchestra or big band. Different singing styles include art music such as opera and Chinese opera, Indian music, Greek music, Japanese music, and religious music styles such as gospel, traditional music styles, world music, jazz, blues, ghazal, and popular music styles such as pop, rock, and electronic dance music.
Singing children
Children's choir
Cross-section of the head and neck
Ercole de' Roberti: Concert, c. 1490