Sailing comprises
wind propulsion of a craft by means of
sails and steering it over water,
ice or
land, depending on the type of craft. A
sailor manages the
force of the wind on the sails by adjusting their angle with respect to the moving sailing craft and sometimes by adjusting the sail area. The force transmitted from the sails is resisted by forces from the
hull,
keel, and
rudder of a sailing craft, by forces from skate runners for an iceboat, and by forces from wheels for a land sailing craft to allow steering a course on a
point of sail with respect to the true wind.