Exposure determines how light or dark an image would appear when it’s being captured by the camera. It is determined by the ISO, aperture, and shutter speed. To have the correct exposure you would need to not let too much or too little light in. Which means you would need to set the camera to the correct aperture. Aperture controls the area over which light can enter your camera. The shutter speed controls the duration of the exposure. ISO speed controls the sensitivity of your camera’s sensor to a given amount of light. The shutter speed determines when the camera sensor will be open or closed to incoming light from the camera lens.