What is PubSub?

PubSub (Publish-Subscribe) is a messaging pattern where senders of messages, called publishers, do not program the messages to be sent directly to specific receivers, called subscribers. Instead, published messages are categorized into channels or topics, and subscribers express interest in one or more channels or topics, receiving only messages that are of interest. This decouples the publishers from the subscribers, allowing for a more flexible and scalable system. It's commonly used in event-driven architectures, real-time data streaming, and asynchronous communication between microservices.