Why Apache Kafka is bettern than any other Message System?

[이연옥]

Hi, all.
I just got curiosity why Apache Kafka is better than any other Message System 
in terms of throughput, and durability.
What’s the fact to let Kafka have better performance?
I read some documents and researched, however, I am not quite sure about that..
And Zookeeper in Apache Kafka seems like a SPOF, Doesn’t it?
How Kafka be implemented in real world web-site?