What Does Shutter Mean In Photography?

The shutter in a camera controls the amount of time the camera sensor is exposed to light. When you press the shutter release button, the shutter raises and lets light into the sensor. You set the shutter speed, which is the amount of time the shutter is open as the sensor is exposed to light. The longer the shutter speed the more light that reaches the sensor. The shorter the shutter speed the less light that reaches the sensor.

Shutter speed is one of the three elements of the exposure triangle, along with aperture and ISO.