What is the shutter speed? explain why a photographer may want to use different shutter speeds in different situations.

Shutter speed or exposure time is the length of time when the film or digital sensor inside the camera is exposed to light, also when a camera's shutter is open when taking a photograph.
If you are photographing a subject that is in motion, you will get different effects at different shutter speeds. The faster the shutter speed, the shorter the time the image sensor is exposed to light; the slower the shutter speed, the longer the time the image sensor is exposed to light.

They used it to make different appt

Ibelieve it is called classical  sculpture