A javabean tutorial provided by sun, I could have written my own tutorial/guide about javabeans but I think sun's tutorial explanation will be more clear than i can explain :)
JavaBeans™ is a portable, platform-independent component model written in the Java programming language. The JavaBeans architecture was built through a collaborative industry effort and enables developers to write reusable components in the Java programming language.
With the JavaBeans API you can create reuseable, platform-independent components. Using JavaBeans-compliant application builder tools, you can combine these components into applets, applications, or composite components.
JavaBean components are known as beans. Beans are dynamic in that they can be changed or customized. Through the design mode of a builder tool, you use the property sheet or bean customizer to customize the bean and then save (persist) your customized beans.
http://java.sun.com/docs/books/tutorial/javabeans/
