A spool is a cylindrical device used to wind and store materials such as thread, wire, or cable. It typically has a central core and flanges on either end to keep the material in place. Spools are commonly made from plastic, wood, or metal and come in various sizes depending on the application. In addition to sewing and crafting, spools are also essential in industries like telecommunications and manufacturing, where they hold fiber optic cables or electrical wires. Properly storing materials on spools helps prevent tangling and damage, making them a practical solution for organization and transport.