Balanced forces are forces acting on a body in the opposite directions, but are equal. If balanced forces act on a stationary object, the net force acting on the object cancel out, because the forces acting on the object will be equal and opposite, and thus the object tends to remain at rest. If the balanced forces act on the object in uniform motion, then the object tends to remain in uniform motion.
Unbalanced forces are those forces that act on an object but are not equal. Unbalanced forces produce motion in a stationary object, or stop an object in motion.