A den is a comfortable, usually secluded room in a house. In the United States, 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 studies, family rooms, home offices, libraries, home cinemas, or even spare bedrooms. In some places, particularly in parts of the British Isles, a small den may be known as a snug. While living rooms tend to be used for entertaining company on formal occasions, dens, like other family rooms, tend toward the more informal. In houses that do not have dedicated family rooms or...