Four-Dimensionalism is a philosophical theory that suggests objects are not just three-dimensional but also extend through time, making them four-dimensional entities. This view posits that an object is made up of a series of temporal parts, or "time slices," each representing the object at different moments in its existence. According to Four-Dimensionalism, just like a film consists of a sequence of frames, an object’s existence is a series of stages over time. This perspective contrasts with three-dimensionalism, which views objects as having a fixed existence at any given moment. Key figures in this debate include philosophers like David Lewis and John McTaggart.