What is Driver and Stub?

Driver:-
(i) Driver : It is a temporary Calling program.It functions similarly like main module for calling the sub modules.
(ii) Drivers are dummy lines of code, Used in Bottomup Approach, calling programs.

Stub:-
(i) Stub : It is a temporary called program.It functions similarly like sub modules when called by the main module.
(ii) Stubs are dummy windows, Used in Topdown Approach, called programs.