KSQL is a streaming SQL engine that enables real-time data processing on Apache Kafka streams. It provides a simple and interactive SQL interface for stream processing, eliminating the need to write code in programming languages like Java or Python. KSQL supports various stream processing operations, including aggregations, joins, windowing, sessionization, and more. This technology simplifies streaming applications by integrating tables and streams, allowing users to join current state data with continuous event streams. KSQL enables real-time monitoring, anomaly detection, security, online data integration, and application development. It uses Kafka's Streams API internally and provides a distributed SQL engine for queries and control. The technology is designed to turn the database inside out by using Kafka as the core storage abstraction for streaming data, allowing for real-time processing and materialized views over the log. KSQL is currently in developer preview and will receive additional capabilities as it evolves into a production-ready system.