Which part of the respiratory system is called windpipe?

The trachea or windpipe, is a tube that connects the pharynx and larynx to the lungs, allowing the passage of air. The trachea begins immediately below the larynx (voice box) and runs down the center of the front part of the neck and ends behind the upper part of the sternum. Here, it divides to form two branches that enter the lung cavities. The trachea is made up of fibrous and elastic tissues and smooth muscle.