4. Aperture: controls the area over which light can enter your camera

Shutter speed: controls the duration of the exposure.
ISO speed: controls the sensitivity of your camera’s sensor to a given amount of light.

1. A photograph exposure determines how light or dark an image will appear when it’s been captured by your camera.

2. Large aperture lets more light to the camera shutter for an exposure.

3.  Slow shutter speeds allow more light into the camera sensor and are used for low-light and night photography.

                                                     5. brief Summary

1. Faster shutter speeds give the sensor less time to collect light and thus, result in a lower exposure.

2. A narrower aperture (or higher f-number) allows less light to reach the sensor.

3. The ISO speed determines how sensitive the camera is to incoming light.