What is the main purpose of the Apache Kafka system and why is it widely used in modern projects?

Apache Kafka is a distributed data streaming platform designed for processing large volumes of messages in real-time. Kafka's main purpose is to provide a high-performance, scalable, and fault-tolerant messaging system between different application components.

Why Kafka is widely used:

• High throughput: capable of processing millions of messages per second.
• Scalability: easily scales horizontally due to its distributed architecture.
• Reliability: supports data replication and fault tolerance.
• Flexibility: suitable for various scenarios — from logging and monitoring to building real-time systems and microservices.

Example of use: an e-commerce system can use Kafka to transmit events about orders, inventory updates, and notifications, ensuring asynchronous interaction between services.