Spring Bean is nothing special, any object in the Spring framework that we initialize through Spring container is called Spring Bean. Any normal Java POJO class can be a Spring Bean if it’s configured to be initialized via container by providing configuration metadata information. (Link)

There're some important concepts in Spring Framework. The following contents are from https://www.baeldung.com/inversion-control-and-dependency-injection-in-spring. 1. Inversion of Control Inversion of Control is a principle in software engineering which transfers the control of objects or portions of a program to a container or framework. In contrast with traditional programming, in which our c..