Lip sync, lip-sync, lip-synch (short for lip synchronization) is a technical term for matching lip movements with sung or spoken vocals. 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 a commonly used shortcut, but it can be considered controversial. 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. Strategy video games make extensive use of lip-synced sound files to create an immersive environment.

Though lip-synching, also called miming, can be used to make it appear as though actors have musical ability (e.g., The Partridge Family) or to misattribute vocals (e.g. Milli Vanilli), it is more often used by recording artists to create a particular effect, to enable them to perform live dance numbers, or to cover for illness or other deficiencies during live performance. Sometimes lip-synching performances are forced by television for short guest appearances, as it requires less time for rehearsals and hugely simplifies the process of sound mixing. Some artists, however, lip-synch as they are not as confident singing live and lip-synching can eliminate the possibility of hitting any bad notes. The practice of lip synching during live performances is frowned on by many who view it as a crutch only used by lesser talents.

Lips are a visible body part at the mouth of humans and many animals. Lips are soft, movable, and serve as the opening for food intake and in the articulation of sound and speech. Human lips are a tactile sensory organ, and can be erogenous when used in kissing and other acts of intimacy.

The upper and lower lips are referred to as the "Labium superius oris" and "Labium inferius oris", respectively. The juncture where the lips meet the surrounding skin of the mouth area is the vermilion border, and the typically reddish area within the borders is called the vermilion zone. The vermilion border of the upper lip is known as the cupid's bow. The fleshy protuberance located in the center of the upper lip is a tubercle known by various terms including the procheilon (also spelled prochilon), the "tuberculum labii superioris", and the "labial tubercle". The vertical groove extending from the procheilon to the nasal septum is called the philtrum.

The skin of the lip, with three to five cellular layers, is very thin compared to typical face skin, which has up to 16 layers. With light skin color, the lip skin contains fewer melanocytes (cells which produce melanin pigment, which give skin its color). Because of this, the blood vessels appear through the skin of the lips, which leads to their notable red coloring. With darker skin color this effect is less prominent, as in this case the skin of the lips contains more melanin and thus is visually darker. The skin of the lip forms the border between the exterior skin of the face, and the interior mucous membrane of the inside of the mouth.

Sync or synch may refer to:

Emily Jean "Emma" Stone (born November 6, 1988) is an American actress.

Stone was a cast member of the TV series Drive, and made her feature film debut in the comedy Superbad (2007). She appeared in The House Bunny (2008) and Ghosts of Girlfriends Past (2009). She then starred in the horror-comedy Zombieland and the indie comedy Paper Man in 2009. In 2010, Stone voiced the character Mazie in Marmaduke, and starred in the high school comedy Easy A, which earned her a nomination for a Golden Globe for Best Actress in a Musical or Comedy. In 2011, she starred in the films Crazy, Stupid, Love. and The Help, both of which were well received by critics and commercial successes. Stone will play Gwen Stacy in the Amazing Spider-Man film, a reboot of the Spider-Man film franchise.

Stone was born in Scottsdale, Arizona, the daughter of Krista (née Yeager), a homemaker, and Jeff Stone, a contractor. She has a brother, who is two years her junior. Stone's paternal grandfather was of Swedish descent, and his family's surname was anglicized to "Stone" when immigrating to the U.S. through Ellis Island; some of her ancestors also lived in Pennsylvania Dutch Country.

Paul Stephen Rudd (born April 6, 1969) is an American actor, comedian and screenwriter. He has primarily appeared in comedies, and is known for his roles in the films Clueless, Wet Hot American Summer, Anchorman, Halloween: The Curse of Michael Myers, The 40-Year-Old Virgin, Knocked Up, Forgetting Sarah Marshall, Dinner for Schmucks, The Object of My Affection, Role Models, I Love You, Man, and Our Idiot Brother. In television, he appeared on the NBC sitcom Friends, playing Mike Hannigan, Phoebe Buffay's boyfriend and later husband, and is commonly featured on the Tim and Eric show.

Rudd was born in Passaic, New Jersey. His parents, both natives of London (England), were Jewish, and were descended from immigrants from Russia and Poland; the family's original surname, "Rudnitzky", was changed by his grandfather to "Rudd". Rudd had a bar mitzvah. His father, Michael, was a historical tour guide who was formerly the vice president of World Airways, while his mother, Gloria, was a sales manager at the television station KSMO-TV. When he was ten, Rudd's family moved to Overland Park, Kansas, where he was raised; his family also spent three years living in Anaheim, California, because of his father's occupation. He attended high school at Shawnee Mission West and college at the University of Kansas, where he was a member of the Nu Chapter of Sigma Nu. He spent three months studying Jacobean drama at the British American Drama Academy based in Oxford, U.K.