A brig is a type of sailing vessel that typically has two masts, both of which are square-rigged. This design allows for efficient sailing and maneuverability, making brigs popular in the 18th and 19th centuries for trade and naval purposes. They often carried cargo or were used for military operations. Brigs were known for their speed and ability to sail close to the wind, which made them effective in various maritime conditions. They played a significant role in maritime history, influencing naval tactics and trade routes during their peak usage. Notable examples include the HMS Beagle, which was a brig-sloop.