To scry is to peer into some object, usually a crystal ball, looking for signs and omens of the future. If you visit a fortune teller at the fair, you can pay them to scry for you.
Sometimes scrying is called "peeping" or "seeing," since a fortune teller scries by peering intently into a mirror, crystal, or another reflective surface. You might ask a medium to scry for you if you're struggling to make a difficult decision — or just for fun, to hear predictions about the future course of your life. Scry is a shortened form of descry, "to spy something."