A camera dolly is a wheeled cart or track system used in filmmaking and video production to create smooth camera movements. It allows the camera to move closer to or further away from a subject, or to follow action seamlessly, enhancing the visual storytelling. Dollies can be used in various ways, such as tracking shots, where the camera moves alongside a subject, or crane shots, where it moves up and down. This equipment is essential for achieving professional-looking footage and is often used in conjunction with tripods and steadicams for stability.