A wedding ring is a symbol of marriage and love. It is worn on the third finger of the left hand because it was once believed that the vein in this finger, called the ring finger, led directly to the heart.
The tradition of wearing a wedding ring on the third finger dates back to Roman times, when it was believed that the vein in this finger, called the vena amoris, or vein of love, flowed directly to the heart. In medieval Europe, people also wore their wedding rings on their left hands because this was considered to be the weaker hand and more likely to be injured in battle.
Today, most people wear their wedding rings on their left hands because it is more convenient for them and because it does not get in the way as much as if it were worn on the right hand.