A den is a small room in a house where people can pursue activities in private. In North America, the type of rooms described by the term den varies considerably by region. It is used to describe many different kinds of bonus rooms, including family rooms, libraries, TV rooms, home cinemas, spare bedrooms, studies or retreats. The etymology of “den” stems from an animal’s den; such as the American black bear, among others. In some places, particularly in parts of the British Isles, a small den may be known as a snug.