Exposure is how light or dark the photo comes out. It is determined by three different things, aperture, ISO and shutter speed (the “exposure triangle”). Each camera setting controls different things. The aperture is how big the hole in the camera is the get the light in. The bigger the hole, the more light gets in the shot. Shutter speed controls how long the light is exposed to the camera. It should be controlled according to the object you are taking a picture of and how you want the photo to come out. The ISO speed is your camera’s sensitivity to light. Unlike the other settings, you almost always want your ISO speed to be low.