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. Java Bean components are known as beans. Beans are dynamic in that they can be changed or customized.
Advantages of Java Beans
Software component architecture provides standard mechanisms to deal with software building blocks. The following list enumerates some of the specific benefits that Java technology provides for a component developer:

• A Bean obtains all the benefits of Java's "write-once, run-anywhere" paradigm.
• The properties, events, and methods of a Bean that are exposed to an application
  builder tool can be controlled.
• A Bean may be designed to operate correctly in different locales, which makes it
  useful in global markets.
• Auxiliary software can be provided to help a person configure a Bean. This software is only needed when the design-time parameters for that component are being set. It does not need to be included in the run-time environment.
• The configuration settings of a Bean can be saved in persistent storage and restored at a later time.