Lip syncing is the act of matching spoken or sung words with the movements of one's lips. This technique is often used in performances, music videos, and films to create the illusion that a person is singing or speaking live, even if they are not. It allows performers to focus on their stage presence and choreography without worrying about vocal performance. In the world of entertainment, lip syncing is commonly seen in music concerts, television shows, and movies. Some artists, like Britney Spears and Ashlee Simpson, have faced criticism for using lip syncing during live performances, sparking debates about authenticity in the music industry.