Shutter speed refers to the amount of time that the shutter of the camera is open. The shutter is what stops light from entering the camera, and when opened, the light is allowed to come through and create the picture. If the shutter speed is slower, the time of exposure will be longer which allows more light to enter the camera.
Aperture is the unit of measurement that describes the size of the opening that the light can travel through to enter the camera. Aperture is used alongside shudder speed to control the amount of light let into the camera when taking a picture.
ISO is the setting on the camera that controls the brightness of the picture. If the iso is moved up, the picture will become progressively brighter, and if the iso is moved down, the picture will become darker.
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