Spring Framework is an open source framework. This is written in Java and developed by Pivotal software. Any Java-based enterprise applications can use the core of this framework. Spring Framework uses the Plain Old Java Object (POJO), which makes it easier to build an enterprise application.
A POJO is a Java object that isn't bound by any restriction other than those forced by the Java language specification. POJOs are used to increase the readability and reusability of an application.
Let's learn the advantages of Spring and architectures in the following sections.