Free Blowing: involves the blowing of short puffs of air into a molten portion of glass which is gathered at one end of the blowpipe and then worked into shape.
Mold Blowing: an alternate glassblowing method that came after the invention of free-blowing. A glob of molten glass is placed on the end of the blowpipe which is then inflated into a wooden or metal carved mold. In this way, the shape and the texture of the bubble of glass is determined by the design on the interior of the mold.
Single Mold: allows the finished glass object to be removed in one movement by pulling it upwards from the single-piece mold and is largely employed to produce tableware and utilitarian vessels for storage and transportation.
Multi-Piece Mold: joins together many pieces, thus permitting the development of more sophisticated surface modeling, texture and design.