The Genoa, aka genny, jib, forsail, etc is the front sail. Usually the Genny is decribed in a %; that % is the % disatance from the bow to the mast. a 100% genoa reaches from the bow stay to the mast when in a close reach. Some boats ( like hobie cats and small craft) have a smaller jib, say 70%, (or even no jib) they dont reach as far as the mast. The family had a 26' sailboat, rigged for racing, that had a genny of 170% ( it reached all the way from the bow to the winch on the side of the cockpit - overlapping the mainsail). The second forsail is the cutter, and if I remember correctly, it can be a boom sail