I'm a newbie here and I've been self learning photography myself and have been dependent on resources on the net to improve my photography knowledge. I would like to know what is the relation between ISO, Aperture and Shutter Speed. I've been reading much on them on the net but I just couldn't get the relation between them. Can any one help me? If possible explain to me in layman's term as I'm still new may not understand the difficult word.