Answer: The Java ES software consists of a collection of Sun server-side products and their supporting components that work together to support distributed applications across a network.
Product components These are the Java ES components that can be selected for installation by the Java ES installer. For a list of product components, see Java ES Components Used in This Release in Sun Java Enterprise System 5 Installation Guide for UNIX. For brief descriptions of these components, refer to Appendix A, Java ES Components, in Sun Java Enterprise System 5 Technical Overview.
Shared components These components support the product components and are selected automatically by the installer. For a list of shared components, see Shared Components in Sun Java Enterprise System 5 Installation Guide for UNIX.
Java ES components are combined into different suites that provide particular sets of services. Depending on your deployment, you might be interested in downloading a suite rather than the entire Java ES distribution. See Q17: What download media is available?