Sail support consists of four components: a YARD, a MAST, a topmast, and a SPAR. The YARD is a horizontal pole that is attached to the MAST and extends outwards from it. The MAST is a vertical pole that supports the sails. The topmast is an extension of the MAST that is used to support the sails at a higher level. The SPAR is a long pole that is used to support the sails and provide stability. Finally, the GAFF is a curved pole that is used to support the upper edge of the sail. Together, these components provide the necessary support for a sailboat's sails.