|This article is about an older version of DF.
A building is a structure that can be placed from the uild menu and then interacted with by the Set Building Tasks/Prefs command ( ), and the View Items in Buildings command ( ). Included in this are workshops, doors, trade depots, furniture, bridges, traps -- most of the interesting stuff your dwarves will build!
Most buildings are made from raw materials or blocks, although some workshops require some additional finished items as well.
Some buildings are placed furniture; a cage or throne sitting in a stockpile is just furniture and can be moved by haulers, washed away by flooding, etc., but when uilt they become a building that can be interacted with. (Or, what seems more accurate to say, a new building is created and the original furniture becomes part of that building's permanent inventory.) Some buildings can be used to define rooms.