A reactive system is meant to be more loosely coupled, flexible, easy to migrate, and easily scalable on demand. These qualities make it easy to develop, gracefully handle faults, and react to errors. Errors are met with elegance rather than claustrophobic disasters. Reactive systems are effective and instantly respond, giving effective and interactive feedback to users. In order to summarize all the traits of a reactive system, the Reactive Manifesto was introduced. In this section, we'll look at the Reactive Manifesto and all the criteria needed. Now, let's look at what the Reactive Manifesto states.