1. The portion of a packet, preceding the actual data,
containing source and destination addresses, error checking
and other fields.
2. The part of an electronic mail message or news article
that precedes the body of a message and contains, among other
things, the sender's name and e-mail address and the date and
time the message was sent.
Nearby terms:
HDTV « hdx « Head Disk Assembly « header » Head Normal Form » head normalisation theorem » heads down
