What is Difference between NameSpace and Assembly In .Net

what is the difference between namespace and assembly is the most frequently asked question in the interview and its very easy to understand the differnce,Following are the differences between namespace and assembly:

NameSpace is a Collection of names while each name is Unique,They form the logical boundary for a Group of classes,Namespace must be specified in Project-Properties.
While an assembly is physical grouping of logical units, Namespace, logically groups classes.


a source code contains classes,interfaces and other type if we want to separate different-2 type of functionality then we use namespace we make classes that have different -2 type of functionality we placed it at different - 2 namespaces for distinguishing the functionality separately, and when we built the application it generate the physical unit called assembly having lot of logical namespaces and classes.