> Apache Kafka is not an implementation of a message broker. Instead, it is a distributed streaming platform. Unlike RabbitMQ, which is based on queues and exchanges, Kafka’s storage layer is implemented using a partitioned transaction log. Kafka also...

This seems like an important passage, drawing the crucial and long-awaited distinction between RabbitMQ and Kafka, and yet without having defined a "partitioned transaction log" the author strands the reader without any help in absorbing the distinction.