Message Queue vs Message Bus — what are the differences?

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Message Bus

A Message Bus is a messaging infrastructure to allow different systems to communicate through a shared set of interfaces(message bus).

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Source: EIP

Message Queue

The basic idea of a message queue is a simple one:

  • Two (or more) processes can exchange information via access to a
    common system message queue    .

  • The sending process places via some (OS) message-passing module a
    message onto a queue which can be read by another process

Source: Dave Marshall

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Image source

Difference

Message Queue contains FIFO(first in first out) rule whereas in Message Bus does not.

Conclusion

Both LOOK like doing same kind of work – passing messages between two Applications or Modules or Interfaces or Systems or Processes, except small difference of FIFO

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