Assemblies are the fundamental units of deployment, version control, reuse, activation scoping, and security permissions for $.$NET$-$based applications. An assembly is a collection of types and resources that are built to work together and form a logical unit of functionality. Assemblies take the form of executable $(.$exe$)$ or dynamic link library $(.$dll$)$ files, and are the building blocks of $.$NET applications. They provide the common language runtime with the information it needs to be aware of type implementations.