In the earlier section of this chapter, we covered how application requirements have drastically changed over the last decade. To cater to this, there is a concept of application development named reactive applications.

It is important to understand the difference between reactive programming and reactive applications. Employing reactive programming doesn't produce reactive applications, but concepts of reactive programming can definitely aid in building reactive applications.

Knowing the Reactive Manifesto will help you understand reactive applications/systems because the manifesto clearly dictates each and every aspect of reactive applications.