Banners are long strips of material bearing a slogan or design, with the intent of representing a company, organization, government, or other entity. They are not rigid, unlike traditional signs.

Though the dictionary may describe banners as being made of cloth, these days a banner can consist of several different materials, all with varying degrees of thickness, pliability, and durability. Banners are differentiated from flags by how they are displayed, rather than by color, shape, or designs. A banner will be attached at both ends, whereas a flag tends to be attached on a single side to a post or pole.