Kafka emphasizes the need to create topic replicas. These are used to build Kafka deployments that are both durable and highly available. Whenever a broker fails, the topic copies on other brokers remain operational, ensuring that information is not erased and Kafka deployment is not affected. Replication guarantees that the messages that have been published do not go missing. It provides the number of copies of a subject that are stored across the Kafka cluster. It occurs at the partition level and is controlled by a person. The replication factor cannot exceed the entire number of brokers in the cluster.