What do you mean by type library?

A file or part inside another record that contains standard descriptions of exposed objects, properties, and strategies.  It is a type of library contains a binary description of an interface exposed by a COM-segment. In this sense, they contain a similar data that is contained in an IDL (Interface Definition Language) document. It is a binary document. DCOM or COM properties, objects and methods are stored in the library. It also gives automatic cross-apartment, cross process and cross machine for portraying the interfaces.