title: When to use ConcurrentKafkaListenerContainerFactory?
body: <p>I am new to kafka and i went through the <a href="https://docs.spring.io/spring-kafka/api/org/springframework/kafka/config/ConcurrentKafkaListenerContainerFactory.html" rel="noreferrer">documentation</a> but I couldn't understand anything. Can someone please explain when to use the <code>ConcurrentKafkaListenerContainerFactory</code> class? I have used the <code>Kafkaconsumer</code> class but I see <code>ConcurrentKafkaListenerContainerFactory</code> being used in my current project. Please explain what purpose it serves.</p>