Now you understand the overall request flow and the responsibility of each component in a typical Spring MVC application, but that is not enough for you to build an online web store application. We also need to know the best practices to develop an enterprise-level web application. One of the best practices in a typical web application is to organize source codes into layers, which will improve reusability and loose coupling. A typical web application would normally have four layers, namely presentation, domain, services, and persistence. So far, what we have seen like the Dispatcher servlet, controllers, view resolvers, and similar, are considered to be part of the Presentation layer's components. Now you need to understand the remaining layers and components one by one.