Flyers are inexpensive to produce and are not a new medium. A flyer or flier, also called a circular, handbill or leaflet, is a form of paper advertisement intended for wide distribution and typically posted or distributed in a public place or through the mail. Flyers may be used by individuals, businesses, or organizations to promote your product or service. Like postcards, pamphlets and small posters, flyers are a low-cost form of mass marketing or communication. There are many different flyer formats.