Un paraguas es un objeto para protegerse de la lluvia. Está formado por una superficie cóncava desplegable, normalmente de tela impermeable o plástico, sujeta a una estructura de varillas dispuestas alrededor de un eje central rematado en uno de sus extremos por una contera que le sirve de apoyo, y por el otro lado terminado en un mango o puño, adecuado para llevarlo con una mano. El ingenio compuesto por rayos y varillas permite cerrarlo cuando no llueve o en un lugar protegido. Un paraguas clásico cerrado puede servir de bastón; no así, por su corto tamaño, la versión "de bolsillo", que tiene varillas que se pliegan por dos o más sitios, más cómodo para guardarlo cuando no llueve. Tanto por su etimología como por su uso no debe confundirse con la sombrilla, también llamada parasol o quitasol.

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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. Umbrellas and parasols are primarily hand-held portable devices sized for personal use. The largest hand-portable umbrellas are golf umbrellas. Umbrellas can be divided into two categories: fully collapsible umbrellas, in which the metal pole supporting the canopy retracts, making the umbrella small enough to fit in a handbag, and non-collapsible umbrellas in which the support pole cannot retract; only the canopy can be collapsed. Another distinction can be made between manually operated umbrellas and spring-loaded automatic umbrellas which spring open at the press of a button. Hand-held umbrellas have some type of handle, either a wooden or plastic cylinder or a bent "crook" handle (like the handle of a cane). Umbrellas are available in a range of price and quality points, ranging from inexpensive, modest quality models sold at discount stores to expensive, finely made, designer-labeled models. Larger parasols capable of blocking the sun for several people are often used as fixed or semi-fixed devices, used with patio tables or other outdoor furniture, or as points of shade on a sunny beach. The collapsible/folding umbrella, the direct predecessor to the modern umbrella, originated in China. These Chinese umbrellas were internally supported with bendable, retractable, and extendable joints as well as sliding levers similar to those in use today. Parasols are sometimes called sunshades. An umbrella may also be called a brolly (UK slang), parapluie (nineteenth century, French origin), rainshade, gamp (British, informal, dated), bumbershoot (American slang).

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