Definitions for "Head Gasket"
A round copper ring that fits between the tops of the cylinders and the heads. Your VW did NOT come with a head gasket (believe it or not!!), but many folks add them to high Performance engines to help ensure a tight seal.
Gasket seal at the main closure of a pressure housing. Usually the seal used between two flanges. Generally either a flat gasket or o-ring.
a gasket to seal a cylinder head
Keywords:  inexpensice, cheap, simple, part
a cheap, simple, and (should be) an inexpensice part
Keywords:  serious, easily, problem, checked, real
a real serious problem and is easily checked