The esophagus is the muscular tube that unites the pharynx with the stomach of vertebrates, and it allows food to travel from the mouth to the stomach. There are three imperative constrictions in the esophagus. The first is the esophagus inlet because of the cricoid cartilage and the pharynx. The second constriction is due to the aortic arch, and the third constriction is found where the esophagus crosses the diaphragm. The trachea, on the other hand, is also known as the windpipe. It is a tube linking the lungs with the pharynx, and it assists with breathing. The trachea lets air flow from the nostrils into the lungs. The trachea also serves a vital role in permitting rapid airflow during coughing and sneezing. The esophagus is a section of the digestive system, while the trachea is involved with the respiratory system.