Pneumatic tubes are systems that transport small items through a network of tubes using air pressure. They are commonly used in hospitals, banks, and large buildings to quickly send documents, money, or medical supplies from one location to another. The items are placed in a capsule that is pushed through the tubes by compressed air. These systems can be efficient and reduce the need for manual delivery, saving time and labor. Pneumatic tubes have been in use since the 19th century and are still relevant today, especially in environments where speed and security are essential, such as in hospitals and financial institutions.