Traditionally, the wedding ring or band is put on the ring finger of the left hand. There is a logical reason too for it. All the finger tips and fingers have pressure points co-relating to different parts of the body. The pressure point on the ring finger of the left hand relates to the heart
It depends on the country you live in. In the United States, traditionally men and women wear their wedding band on their left ring finger. In Mexico however the wedding ring is worn on the right hand. Traditions vary all over the world, usually based on a person's religion.