- Any thought or idea expressed briefly in a plain or secret language, prepared in a form suitable for transmission by any means of communication.
- An arbitrary amount of information whose beginning and end are defined or implied.
- Record information, a stream of data expressed in plain or encrypted language (notation) and prepared in a format specified for intended transmission by a telecommunications system.
See also: instant messaging
In computing, under certain object-oriented programming languages such as Smalltalk and Objective-C, a message is an instruction to an object to perform some task. A message is similar to a member function, however in certain run-time environments such as Objective-C, messages can be forwarded if an object does not recognize — respond to — a certain message.