A slider is a compact, portable camera support system consisting of a short rail or track on which a camera carriage moves smoothly in a linear direction, producing controlled lateral, forward, or diagonal camera movement over a limited distance. Sliders are the portable, lightweight counterpart to full dolly-and-track systems, bringing smooth linear camera movement to productions where a full dolly setup would be impractical due to space, budget, or portability requirements.

Sliders range from simple manual units a half-meter long suited to tabletop work and small cameras, to longer motorized systems of two meters or more capable of carrying cinema cameras. The carriage rides on bearings or wheels along the rail, and the smoothness of the movement depends on the quality of those bearings and the surface flatness of the rail. Motorized sliders add electronic drive systems that allow precise, consistent movement speed regardless of the operator's manual steadiness, enabling time-lapse sequences with imperceptibly slow drift and perfectly repeatable motion control passes. Many sliders include fluid-head capability on the carriage for combined slide-and-pan movements, creating compound trajectories that increase visual interest. Sliders are particularly valuable for adding production value to product shots, interview setups, nature work, and any situation where a small amount of controlled camera movement transforms an otherwise static shot into something more visually engaging. The visual signature of slider movement is its straight, smooth, controlled quality, distinct from the organic variation of handheld shooting.

In AI video generation, slider movement is described by its visual result: "smooth lateral camera drift," "slow linear slide to the right," or "gentle forward slide past the subject" communicates the quality of slider movement without requiring equipment-specific language.