An apron is a garment that is worn over other clothing to cover the front of the body. The word comes from old French napron meaning a small piece of cloth, however over time "a napron" became "an apron", through a linguistics process called rebracketing. It may have several purposes, typically as a functional accessory that protects clothes and skin from stains and marks. However, other types of aprons may be worn as a decoration, for hygienic reasons, as part of a uniform, or as protection from certain dangers such as acid, allergens or excessive heat. It can also be used at work stations to hold extra tools and pieces or protect from dust and unwanted materials.