Christmas lights typically are male/female so that can daisy-chain the together to cover a longer distance. Rather than have to buy a 400 foot cable you would h

Christmas lights typically are male/female so that can daisy-chain the together to cover a longer distance. Rather than have to buy a 400 foot cable you would have 4x100, or 8x50. This is useful so you can more freely extend your decoration, or replace a smaller failed section. If you start with them the wrong way, you have to reverse all the cables.