An umbrella or parasol is a folding canopy supported by wooden or metal ribs, which is mounted on a wooden, metal or plastic pole. It is designed to protect a person against rain or sunlight. The word "umbrella" typically refers to a device used for protection from rain. The word parasol usually refers to an item designed to protect from the sun. Often the difference is the material used for the canopy; some parasols are not waterproof. Umbrella canopies may be made of fabric or flexible plastic.