Cask wine is a type of wine that is stored and aged in a cask, or barrel. The term 'cask wine' can refer to any type of wine that is stored in a cask, including TUN, VAT, ALE, and LEES. TUN is a large cask or barrel, usually made of wood, used for storing and aging wine. VAT is a large container, usually made of wood, used for storing and aging wine. ALE is a type of beer that is fermented and stored in a cask. LEES are the sediment that forms at the bottom of a cask of wine during the aging process.