A module is a portable executable file, such as type.dll or application.exe, consisting of one or more classes and interfaces. There may be multiple namespaces contained in a single module, and a namespace may span multiple modules.

One or more modules deployed as a unit compose an assembly. For information about creating an assembly with more than one module, see Multifile Assemblies.

Note that a .NET Framework module is not the same as a module in Visual Basic, which is used by a programmers to organize functions and subroutines in an application.