Magazines are publications, usually periodical publications, that are printed or published electronically. (The online versions are called online magazines.) They are generally published on a regular schedule and contain a variety of content. They are generally financed by advertising, by a purchase price, by prepaid subscriptions, or a combination of the three. At its root, the word "magazine" refers to a collection or storage location. In the case of written publication, it is a collection of written articles. (This explains why magazine publications share the word root with gunpowder magazines, artillery magazines, firearms magazines, and (in various languages although not English) retail stores such as department stores).