The diaphragm is a dome-shaped muscle located at the base of the chest cavity, separating the thoracic cavity from the abdominal cavity. It plays a crucial role in the process of breathing. When the diaphragm contracts, it moves downward, creating a vacuum that allows air to flow into the lungs. When it relaxes, air is pushed out of the lungs. In addition to its primary function in respiration, the diaphragm also helps in other bodily functions, such as coughing, sneezing, and vomiting. It is essential for maintaining proper pressure in the thoracic and abdominal cavities, contributing to overall health.