In information technology, Header refers to supplemental data placed at the beginning of a block of data being stored or transmitted, which contain information for the handling of the data block.
In data transmission, the data following the header are sometimes called the payload or body.
It is vital that header composition follow a clear and unambiguous specification or format, to allow for parsing.
Examples
In an e-mail, the text (body) is preceded by header lines indicating sender, recipient, subject, sending time stamp, receiving time stamps of all intermediate and the final mail transfer agents, and much more. (See RFC 822 for details.)
In a data packet sent through the internet, the data (payload) are preceded by header information such as the sender's and the recipient's IP addresses, the protocol governing the format of the payload and several other formats. The header's format is specified in the Internet Protocol.
In graphics file formats, the header might give information about an image's size, resolution, number of colors, and the like.
In informationtechnology, Header refers to supplemental data placed at the beginning of a block of data being stored or transmitted, which contain information for the handling of the data block.
It is vital that header composition follow a clear and unambiguous specification or format, to allow for parsing.
In a data packet sent through the internet, the data (payload) are preceded by headerinformation such as the sender's and the recipient's IP addresses, the protocol governing the format of the payload and several other formats.
Header in electronics engineering refers to a component which supplies a physical interface (usually a connector of some type) to a group of signal lines or PCB traces.
Header in association football (soccer) is a use of the player's head to deflect the ball.
A header in rodeo is a competitor in the team roping event who specializes in roping a steer's head.
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