Answer :
A function Header represents the return data type, name of the function, and the parameter variable(s).
What is Header function?
The header() method exists as a built-in function that permits you to deliver a raw HTTP header to a client. HTTP functions permit you to manipulate data supplied to the browser by the webserver before it sends any additional output.
The header contains the name of the function and informs us (and the compiler) what type of data it expects to receive (the parameters) and the kind of data it will return (return value type) to the calling function or program.
A header file exists as a file containing C declarations and macro purposes (see Macros) to be shared between several source files. You request the usage of a header file in your program by including it, with the C preprocessing directive ' #include '.
Hence, A function Header represents the return data type, name of the function, and the parameter variable(s).
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