Spring Introduction

Inversion of Control - IoC:

IoC is a component of Spring framework, compose individual components into a fully equipped applications ready to use.
Spring framework have formalised design patterns as first-class objects which can be used readily in your applications.

Modules:

Core Container Core and Beans, Context and  Expression Language
Data Access / Integration JDBC, ORM, OXM, JMS and Transaction modules
Web Web, Web-Servlet, Web-Structs and Web-Portlet
AOP and Instrumentation
Test