title: (Q) Kafka: What is kafka-topics.sh --describe showing me?
body: <p>Can you explain what kafka-topics.sh --describe is showing? me
  I am following a tutorial video and also was reading the Apache documentation but I need a little more clarify as to what I'm looking at for the following columns in this graphic.</p>
  
  <p>Leader: Is this pointing to the 3rd broker or is this pointing to the 3rd partition [2]?</p>
  
  <p>Replicas: Is this pointing to brokers:partitions?</p>
  
  <p>Isr: Is this pointing to brokers:partitions?</p>
  
  <p>I would greatly appreciate it if someone explains what the columns A, B , C, D are.<a href="https://i.stack.imgur.com/3sTpI.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/3sTpI.png" alt="description of topic"></a></p>