What is header file

Answer 1

Please mention specific language and write right tag.
Tags make it easy to get your answer precisely. All questions are tagged with their subject areas..
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Answer 2

Header file is a file which contains library functions ,global variables and macro definitions. (Extension is. h)
eg; stdio.h , iostream.h , math.h etc

Answer 3

Header file are those files which we write during writing a program which contain standard library functions....for eg. #include <math.h> we use this header file for using library functions like pow(),sqrt().....etc...

Answer 4

Файл с расширением .h. В нем обычно в C++ описывается структура класса.