The Barrel hinge comes in two parts. The threaded part of the hinge is screwed into a pre-drilled hole or mortise. They are used a lot in cabinet making as the hinge body is mortised into the framework of the piece and therefore does not detract from the artistry of the doors or other moving parts of the box or cabinet.
In a well made barrel hinge, the barrel shaped hinge is so well morticed it is not at all visible when the doors are closed.
Barrel hinges are often called SOSS hinges as SOSS is the leading manufacturers of barrel hinges and the brand name has become synonymous with this type of hinge. Much the same as vacuum and Hoover.
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