A mast is a tall, vertical structure that supports and carries something else. In nautical terms, it refers to one of the tall poles or spars that extend vertically on either side of a ship's deck, supporting the sails and rigging. Masts are typically made from wood or metal and can vary in height depending on the type of vessel they are used on. In addition to their structural function, masts also serve as visual indicators of a ship’s size and status, with larger vessels often having taller masts.