A message is the collection of data, organized in segments, exchanged by trading partners engaged in EDI. Typically, a message is an electronic version of a document associated with a common business transaction, such as a purchase order or shipping notice. A message begins with a message header segment, which identifies the start of the message (e.g., the series of characters representing one purchase order). The message header segment also carries the message type code, which identifies the business transaction type.
A message is
|“||a digital transmission sent over a computer system or computer network from one person or computer to another.||”|
|“||[a] unit of data transfer from an application in one host to an application in another host.||”|