Imagine I am a junior in IT. How would you explain what Kafka is and how it works?

Kafka is a messaging system for transmitting messages between different parts of a program or different programs. Imagine you have a mailbox where different people can put letters, and you read them later. In Kafka, these "mailboxes" are called topics.

It works like this: one part of the program (producer) sends messages to a topic, and another part (consumer) reads these messages. Kafka stores these messages very quickly and reliably, even if someone temporarily cannot receive them. This helps different systems communicate with each other asynchronously and in a scalable way.