Sherry casks are barrels that have been used to age sherry, a fortified wine from Spain. These casks are typically made from European oak and can impart unique flavors to spirits aged within them, such as whiskey or rum. The aging process in sherry casks can enhance the complexity and richness of the final product. After their initial use for sherry, these casks are often repurposed for aging other beverages. The residual flavors from the sherry, including notes of dried fruit, nuts, and spices, can significantly influence the taste profile of the spirits, making sherry cask aging a popular choice among distillers.