A folding chair is any chair that folds up for easy storage. Folding chairs are typically plastic; however folding chairs used to be made of metal or wood. Folding chairs tend to be used for banquets or school performances where large numbers of chairs are needed for a short period of time. When the performance/banquet is finished the chairs can then be folded up and stacked away without taking up vast amounts of space. Some folding chairs even allow the legs to be folded up after the chair is collapsed so that what you are left with is height and width of the chair seat.
Many people find folding chairs uncomfortable as they typically do not have any padding or cushioning to save space when folded. Companies have attempted to overcome this shortfall of folding chairs by having the seat and backs of the folding chairs molded to sport ter fit and support people.