lip synchronization

[Gornwexy]

combining audio and video recording in such a way that the sound is perfectly synchronized with the action that produced it; especially synchronizing the movements of a speakers lips with the sound of his speech

[Vihan Dobiriyal]

Lip synchronization, often abbreviated as lip-sync or lip-syncing, is a technique in which an individual or technology matches their lip movements with pre-recorded speech or song to give the illusion that they are the source of the sound. This method is frequently used in music videos, film, television, and live performances.