On a sailboat, the sheet is a line (rope) that is attached to the lower corner of a sail and is used to control the position of the sail in relation to the wind. By pulling in or letting out the sheet, the sailor can adjust the angle of the sail to catch the most wind and propel the boat forward. The sheet is typically controlled by a winch or cleat on the boat to make it easier for the sailor to adjust the sail quickly and efficiently.
