Pneumatic tubes are systems that transport small items through a network of tubes using air pressure. They are commonly used in places like hospitals, banks, and offices to quickly send documents, money, or medical samples 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 very efficient, reducing the time it takes to deliver items compared to traditional methods. Pneumatic tubes have been in use since the 19th century and are still relevant today, providing a reliable way to move materials within buildings or between nearby locations.