Whisky finishing is a process in which a matured whisky is transferred to a different type of cask for a second maturation period. This can be done for a variety of reasons, such as to add additional flavors or aromas to the whisky, or to mellow out the flavor profile. Some common types of casks used for finishing include sherry casks, port casks, and rum casks.
Finishing can have a significant impact on the flavor of a whisky. For example, finishing in a sherry cask can add notes of dried fruit, nuts, and spice to the whisky, while finishing in a rum cask can add notes of vanilla, caramel, and tropical fruit. Finishing can also help to mellow out the flavor of a whisky, making it smoother and more approachable.