What is the concept of assembly in C#?

In C#, an assembly is an executable unit that includes a group of types and resources, as well as an executable file or dynamic link library. Each assembly can be an executable file (such as .exe) or a dynamic link library (such as .dll). Every assembly contains a manifest that describes the types, resources, and other information it contains. In C#, an assembly is the most basic deployment unit and can contain one or more modules. Assemblies can be referenced and called by other programs, and can be deployed to different environments.