Header files Vs. Standard libraries

In my opinion , header file is writing for which i want to do.but standard libraries are more like the tools.

well, header files are those which contains only the header or you can say the declaration of the function whereas in library files there includes all the function defined in that... Keep posting!!!

The header file is C code which defines the interface to the code. The library is resource in some language, not necessarily C, which implements the interface, and which is comprehensible to a loader/linker for inclusion in your programs. A library will often be a translation of C source file(s) which might be distributed with, or instead of, the library file(s).