Flue Damper What's The Difference B/t A Flue And A Damper In A Fireplace?

What's the difference b/t a flue and a damper in a fireplace? - flue damper

A chimney or a series of tubes, carrying the smoke from the fire. A knob controls the amount of air is replaced by a fire. For example, the door all the way in a wood stove and burns very hot, close the registry to keep the fire and burn some more.