What is a growler of beer and how is it typically used in the craft beer industry?

A growler is a container, usually made of glass or stainless steel, used to transport draft beer from a brewery or taproom to be consumed elsewhere. It is typically used in the craft beer industry to allow customers to take home fresh beer directly from the source, often in smaller quantities than a traditional keg. Growlers are popular among craft beer enthusiasts who want to enjoy a variety of beers at home or share them with friends.