Shutter Speed - Aperture - ISO
BY: Richard W. Conrad Jr.
Shutter Speed
the time for which a shutter is open at a given setting.
Aperture
a space through which light passes in an optical or photographic instrument, especially the variable opening by which light enters a camera.
ISO
you're adjusting your camera's sensitivity to light. ISO settings can be anywhere from 24 to 6,400 (or higher), and these numbers have a direct relationship with the device's sensitivity, so a lower setting makes it less sensitive and a high setting makes it more so.
All these things work together to make the exposure triangle.