Explore the complex world of reactive programming in this 51-minute Devoxx conference talk. Dive into the various aspects of reactive development, including Reactive Programming, Reactive eXtensions, Reactive Streams, Reactive Systems, and the Reactive Manifesto. Gain clarity on how these concepts relate to asynchronous programming, scalability, RX libraries, back pressure, streams, observables, futures, promises, and spreadsheets. Learn the practical applications of reactive principles in modern software development and understand why they matter. Follow along with live coding examples using Eclipse Vert.x to see how reactive concepts work together in building distributed systems on the JVM. Benefit from speaker Clement Escoffier's extensive experience in software engineering and open-source contributions as he guides you through the reactive landscape, helping you apply these concepts to your own projects and applications.