Folders are machines used in the printing and paper industry to fold and crease paper, cardboard or other materials. Folding and creasing are processes in which an edge is pressed into the material to fold or bend it. Folder formers consist of a device for feeding the material, a creasing device for creating the creases, a folding device for folding the material, and an output device for unloading the finished product. Fold formers can be either manually operated or fully automated. Folder formers are commonly used in the production of folding cartons, packaging, and brochures. They are also useful in the printing industry, for example to produce folded brochures or flyers.