what is the assembly?

Assembly is a small unit for development
Assemblies are provides Reusability,Versioning,and Security.
Assemblies will maintain collection of userdefined types
and resources information.

Types of assemblies are:
1.public
2.private
3.shared.
4.satellite
there will exceutable(.exe) assembly and Library code(.dll).
Assembly contain version infornmation,metadata,actual code.