"Square-rigged vessel" is a term used to describe a type of ship that uses square sails on its main mast and foremast. There are a number of other terms that can be used to describe this type of vessel, including tall ship, brig, brigantine, and ship of the line. "Tall ship" generally refers to any large sailing vessel, but can also specifically denote a square-rigged ship. A brig is a two-masted sailing ship with a square-rig on the foremast and a fore-and-aft rig on the mainmast. A brigantine has a square-rig on the foremast and a fore-and-aft rig on the mainmast, but with a smaller sail area than a brig.