Carpentry is one of the oldest professions — for as long as people have needed shelter to live in, there has been some form of carpentry. Today, carpentry has become a very specialized trade and most carpenters have a niche. The hallmark of all types of carpentry is that carpenters are experts in working with wood. There are some small exceptions to this for buildings that use steel studs or other types of metal framing, for example. However, for the most part, when you think carpenters, think wood.