- A header is text found at the top of an electronic document or hard copy. For example, in Microsoft Word a header could be created in a document to display the page number in the top corner of each page.
- On a website, the header is the top portion of a web page that contains
the company name and logos. This section also often contains a navigation
bar to help navigate the site.
- When talking about the motherboard, a
header can refer to pins on the motherboard that allow additional ports to
be added to the computer. See our 1394 and USB
header definition for further information.
- More commonly known as an e-mail header, a header is data contained at the beginning of an electronic message that contains information about the message.
The header is used to identify the message, its source and destination, and other information that may be required to decode it and understand the message. The technical specifications on e-mail headers can also be found in RFC821, RFC822, and RFC2045.
Also see: Footer, Hard copy, Odd header, Packet, Running header