What distinguishes blended whiskey from other types?

Blended whiskey is defined by its composition of different whiskeys from various barrels, which may come from different distilleries or even be made from diverse types of whiskey (such as grain and malt). This blending process allows for a complex flavor profile that incorporates the characteristics of each whiskey involved. By using a variety of barrels and styles, makers can achieve consistency and a balanced taste across batches, appealing to a broader audience.

The other options do not accurately represent the nature of blended whiskey. The use of only one type of grain is characteristic of single grain whiskey, not blended whiskey, which often utilizes multiple grains. While maturation in oak barrels is a key part of whiskey production, blended whiskey is not distinguished by a shorter aging period. Furthermore, blended whiskey does not necessitate sourcing all ingredients from a single distillery; it thrives on the combination of whiskeys from various sources to achieve its final flavor. Thus, the defining feature of blended whiskey lies in its diversity and combination of different whiskeys.