A rope is a very thick, strong piece of string. You use rope for tying big things, like the sails on a yacht, like the rope in the picture. A fun use for rope is a tug 'o war. Rope is usually made from the fibre from coconut shells, or a modern fibre like nylon, twisted together so it is thicker. If you need to tie something that is too big or heavy for ordinary rope, you either need rope made from strands of metal or use some steel chain.