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Lip-sync refers to the synchronization of lip movements with dialogue, which is a critical aspect of animation that ensures characters appear to be speaking realistically in accordance with the spoken words. This technique enhances believability and immersion by matching the visual representation of the characters’ mouth movements to the audio of the dialogue.

Achieving effective lip-sync involves analyzing the phonetic sounds of the dialogue and translating those into corresponding mouth shapes or visemes in the animated characters. This attention to detail enriches the storytelling by allowing viewers to connect more deeply with the characters and the emotions they convey through speech.

Other options, such as camera angles, timing of music and sound effects, and visual representations of sound waves, do not directly relate to the art of synchronizing speech within animated content, making them irrelevant to the definition of lip-sync.