What is assembly in .NET?

Assembly is a code library that is partially compiled. It is used for grouping many logical units together. We can use this for deployment and for improving security. One assembly can contain one or many code files. This is because, in .NET, different languages can be used to create one code file. There are two types of assemblies, process, and library assembly. Generally, the .NET assembly contains codes in CIL language which is then compiled by CLR and JIT to machine language.