Synchronous messaging
Synchronous messaging occurs when two systems or applications transmit continuous data streams spaced by fixed time intervals, via timing signals, for transmitter and receiver synchronization. Timing signals ensure that each message is placed in a queue (sometimes known as an event queue) in enterprise messaging systems, until a response is received, prior to continuing the synchronous messaging process.
Asynchronous messaging
Asynchronous messaging is a communication method wherein the system puts a message in a message queue and does not require an immediate response to continue processing. Examples include a request for information, explanation or data needed but not needed immediately.
This term is also known as fire-and-forget information exchange or message-oriented middleware (MOM).
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