Mason is a category profession for dwarves that work with stone. An adult dwarf whose best skill is in this category will be known as a "Mason".
Masons are responsible for creating furniture and other objects out of stone in a mason's workshop. Masonry is also required for constructing designed buildings out of rough stone, stone blocks, or glass blocks.
As stone is plentiful early on in almost any fort, and the tables, chairs, and doors a mason can build are immediately desirable, bringing a mason along is a sensible choice for most starting builds.