what is namespacing and headerfile?

Answer 1

Namespaces are a group of class which is combined under a single name.
Header file(You have gone through the C or C++ right?) is some what similar to the Namespaces. Its in a sense can be called as library. Adding a header file can bring a lot of built in functions to perform an operation.

Namspace are used widely in High level languages like Visual Basic etc. Where as header files can be seen in C, C++ etc.

Both these performs similar operations.

(Namspace (Its has class (Class has objects in it)))

(Header Files(Built in functions))