An umbrella is a portable device designed to provide protection from rain or sunlight. Typically, it consists of a collapsible canopy made of waterproof fabric stretched over a series of supporting ribs. The canopy is attached to a central pole, which can be extended or retracted, allowing the umbrella to open and close. Some umbrellas also feature mechanisms for automatic opening and closing. Umbrellas come in various sizes, from small, compact versions ideal for carrying in bags, to large models that provide wider coverage. Historically, they have been used as both practical tools and fashion accessories.