An assembly is a collection of files (dll’s, exe’s), group of resources that help in creating a logical unit of functionality. It forms the basic building block for deployment, reusability and security issues.

• It provides a CLR environment.
• It helps in maintaining security as it grants grant or denial of permissions.
• When an application starts only assemblies the application initially calls must be present.
• Assemblies can be either static or dynamic.
• Assemblies help in resolving versioning issues.