The Spring Framework is one of the most popular Java application development frameworks used by millions of developers across the world. This comprehensive guide serves as your complete introduction to the key concepts and architecture of Spring. We take you through various modules of the Spring ecosystem step-by-step, explaining the Inversion of Control and Dependency Injection patterns. You will understand how Spring handles configuration and wiring to reduce boilerplate code. We also provide examples of using Spring MVC for building web apps and REST APIs along with best practices. Additionally, you’ll learn integrating Spring with popular databases and ORM tools like Hibernate and JPA. By the end of this guide, you’ll have clarity on all the major building blocks of enterprise Java applications using Spring. An ideal read for anyone looking to get started with this powerful framework and its modular structure.