Answer:
Motion capture, commonly known as mocap, is a technique used to digitally record the movements of people or objects. It involves capturing the actions of actors or performers through special sensors, which are then translated into digital data that can be used to animate characters or objects in films, video games, or other media.
One notable example of motion capture in film is the character Gollum from the "The Lord of the Rings" trilogy, portrayed by Andy Serkis. The actor's movements and expressions were captured using motion capture technology, allowing the character to realistically mimic the actor's performance and appear lifelike on screen.