What is an "umbrella"?

An umbrella is a portable device designed to protect a person from rain or sunlight. It consists of a canopy made of waterproof material such as nylon or polyester, supported by a central shaft with ribs that extend to the edges of the canopy. Umbrellas can be collapsible or non-collapsible, with the former being the most common. Collapsible umbrellas can be further divided into three types: compact, folding, and automatic. A compact umbrella folds down to a very small size, making it easy to carry in a bag or purse. A folding umbrella has two or more sections that fold in on itself for compact storage. An automatic umbrella has a mechanism that allows it to be opened and closed with the push of a button. Umbrellas are often used as a fashion accessories and come in a wide range of colors, styles, and designs.