This document discusses Kappa Architecture 2.0 and tools for real-time data processing. It introduces Jay Kreps, who coined the term "Kappa Architecture" and has worked on several related projects. The document then contrasts the usual batch processing data flow with the Kappa Architecture approach of combining real-time and batch processing. It provides examples of using Spark and Kafka for real-time analytics and discusses taking the Kappa Architecture to version 3.0 with additional tools like Apache Druid, Kafka Streams, and Google Cloud.