Since this book is about reactive programming, we are not going to go into too much detail regarding Spring Boot. However, as the previous section stated, the ability to bootstrap applications fast is a critical ingredient of a successful framework. Let's figure out how reactivity is reflected in the Spring ecosystem. Since we get no benefits from only changing the programming paradigm to reactive programming because of the blocking nature of Spring MVC and Spring Data modules, the Spring team decided to change the whole paradigm inside those modules as well. For that purpose, the Spring ecosystem brings us a list of reactive modules. In this section, we will very briefly cover all of those modules. However, most of them are covered later in the book in dedicated chapters.