In golf, "OB (Out of Bounds)" and "Hazard" are both obstacles that can interfere with the movement of the ball, but there are important differences between the two. OB (Out of Bounds): OB refers to going beyond the boundary line of the course. In other words, the point where OB occurs is outside the course boundary, and if you go beyond OB, you receive an additional penalty stroke. OB is typical..
