nVTBL-A virtual function table is an array of pointers to the methods an object supports.
nDLL-Short for Dynamic Link Library, a library of executable functions or data that can be used by an application
nObject-An object is a self-contained entity that consists of both data and procedures to manipulate the data
nHierarchy:A partially-ordered structure of entities in which every entity but one is successor to at least one other entity; and every entity except the basic entities is a predecessor to at least one other entity