The term "4D" stands for four-dimensional, referring to a space that adds a temporal or time dimension to the traditional three spatial dimensions of height, width, and depth. In various technical and creative industries, 4D can describe multiple concepts: in computer graphics and animation, it incorporates time-based changes; in manufacturing and engineering, it involves 3D printing with smart materials that transform over time; and in entertainment, it refers to 3D film screenings enhanced with physical environmental effects like motion seats, wind, scents, and mist to create an immersive sensory experience for audiences.