What is the difference between Message Broker and Message Bus?
Firstly, let's be clear, the terms Message Broker and Message Bus are used in architectural patterns for messaging systems, also referred to as messaging topologies. Whilst a Message Bus is one such topology, a Message Broker is only one component in an alternative topology known as Hub and Spoke.
What are message brokers used for?
A message broker is an architectural pattern for message validation, transformation, and routing. It mediates communication among applications, minimizing the mutual awareness that applications should have of each other in order to be able to exchange messages, effectively implementing decoupling.
What is a messaging bus?
A Message Bus is a combination of a common data model, a common command set, and a messaging infrastructure to allow different systems to communicate through a shared set of interfaces.