The shutter speed on a camera is set using the shutter speed dial. Shutter speed determines how long the shutter will remain open while recording a photograph.
The longer the shutter speed, the more light is recorded; conversely, the shorter the shutter speed, the less light is recorded. You select your shutter speed by turning the shutter speed dial.
On older cameras, the shutter speed dial with marked calibrations is located on the outside of the camera body. On digital cameras, you view a shutter speed readout from an LCD panel or through the viewfinder.