We have various frameworks in Java. Spring framework is most popular out of them. Some other commonly used frameworks are Struts, JSF, but Spring has already dominated all of them. Let's understand why is Spring framework so popular ?. At its core, the Spring Framework includes the principles of simplicity, modularity, and loose coupling. It provides developers with a unified programming model that simplifies the complexities of enterprise application development. With its popular dependency injection mechanism, Spring allows the creation of highly modular and testable code. It also makes developers free from the burden of managing complex dependencies manually. Before directly coming to 'Why is Spring Framework so Popular ?', let's first understand the basic terminology 'What is a Framework?'. What is