An individual unit of data transported between endpoint locations. A message consists of a document plus a header (information about the transfer).
— Computer ScienceA message that is sent over a communications network such as a local area network or the Internet.
— Computer Science1. Any thought or idea expressed briefly in a plain or secret language and prepared in a form suitable for transmission by any means of communication. 2. A narrowly focused communication directed at a specific audience to support a specific theme.
— USA Army