A broker is someone or something that acts as an intermediary third party, managing transactions between two other entities. In a computing context, a broker is a type of software, often a middleware program, like a message broker.Click to see full answer. Similarly, you may ask, what is a broker in networking?In a telecommunication network where programs communicate by exchanging formally-defined messages (that is, through the act of messaging), a message broker is an intermediary program that translates messages from the formal messaging protocol of the publisher to the formal messaging protocol of the receiver.Subsequently, question is, what is ActiveMQ broker? Apache ActiveMQ is an open source message broker written in Java together with a full Java Message Service (JMS) client. The communication is managed with features such as computer clustering and ability to use any database as a JMS persistence provider besides virtual memory, cache, and journal persistency. Similarly, you may ask, why do we need message broker? 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. The primary purpose of a broker is to take incoming messages from applications and perform some action on them.What is a message broker in Kafka? Kafka Broker A Kafka cluster consists of one or more servers (Kafka brokers), which are running Kafka. Producers are processes that publish data (push messages) into Kafka topics within the broker. A consumer of topics pulls messages off a Kafka topic.