Question

what is header? .....​

Answer 1

Answer:

A header is a unit of information that precedes a data object. In a network transmission, A header is part of the data packet and contains transparent information about the file or the transmission.

Explanation:

Answer 2

Answer:

In information technology, header refers to supplemental data placed at the beginning of a block of data being stored or transmitted. In data transmission, the data following the header is sometimes called the payload or body.

It is vital that header composition follows a clear and unambiguous specification or format, to allow for parsing.