Apache Kafka: The Backbone of Real-Time Data Systems

Apache Kafka is not just a messaging tool. It is a distributed, fault-tolerant, high-throughput event streaming platform designed to handle data in motion. Kafka exists because traditional request–response systems collapse when data volume, velocity, and reliability requirements increase. This article explains Kafka from the ground up: what problems it solves, how it works internally, how it is used in real systems, and what interviewers actually expect you to understand.