This article will talk about the vital concepts that every Java developer should know. In the subsequent sections, the answers to questions like – What is Spring Framework, what is Spring Boot, and Differences between Spring Framework and Spring Boot will be answered. By the end of this article, readers will be able to have a better understanding of the above-mentioned topics and answer their most frequently asked questions. What is Spring Framework? Spring Framework is a widely utilized Java framework for building applications. By leveraging the benefits associated with Spring Framework, developers can develop stand-alone applications, web applications, distributed applications, and much more. This framework strives to simply Java Enterprise Edition development, further enabling developers to be more productive. In other words, Spring Framework offers several features to the developers so that they can complete more work in less time. The primary feature of the Spring Framework is dependency injection. Dependency injection is nothing but the process of injecting dependent objects into target objects. For instance, if the controller class wants to talk to the service class method, the service class object will be injected into the controller class. Instead of the programmer injecting dependent objects into the target object, Spring Framework will operate for us. This is one of the vital features of Spring Framework.