What are the differences between .mod, .obj, .lib, .exp, .exe, .dll and .def?

.mod                                        is a description of the contents of a F95 module
emitted by the compiler when compiling a module read by the compiler when compiling a use statement located by the compiler using INCLUDE environmental variable

.obj                                          is a description of the program suitable for linking

.lib                                           is an index of the contents of a dll used by the linker

.exp                                         is an index of the symbols exported by a dll

.exe                                         is an executable program

.dll                                          is a dynamic link library located at run time using PATH env variable

.def                                          is a text file which tells the linker what to put into a .dll