Cask maturation is the process where spirits, such as whiskey or rum, are aged in wooden barrels, typically made from oak. During this time, the liquid interacts with the wood, which can enhance its flavor, aroma, and color. The aging process allows the spirit to absorb compounds from the wood, leading to a smoother and more complex profile. The environment where the cask is stored also plays a significant role in maturation. Factors like temperature, humidity, and air quality can affect how the spirit interacts with the wood. Over time, these elements contribute to the final character of the drink, making each cask maturation unique.