A wood- or barrel-aged beer is any lager, ale or hybrid beer, either a traditional style or a unique experimental beer, that has been aged for a period of time in a wooden barrel or in contact with wood. This beer is aged with the intention of imparting the unique character of the wood and/or the flavor of what has previously been in the barrel. Beer may be aged in wooden barrels (new or previously used to age wine or spirits), or chips, spirals and cubes may be added to the conditioning tanks that normally house beer. A variety of types of wood are used including oak, apple, alder, hickory and more. The interior of most barrels is charred or toasted to further enhance the flavor of the wood.