ActiveMQ

ActiveMQ is an open-source messaging system that enables different applications to communicate with each other reliably and asynchronously. Think of it as a central post office where messages are sent, stored briefly, and then delivered to the intended recipients when they are ready. This decouples the sender and receiver, allowing them to operate independently and improving system efficiency. Used in various enterprise environments, ActiveMQ supports multiple messaging protocols and ensures that messages are delivered accurately even if parts of the system experience delays or downtime.