• Java technology applications are typically general-purpose programs that run on any machine where the Java runtime environment (JRE) is installed.
  
• There are two main deployment environments:

1. The JRE supplied by the Java 2 Software Development Kit (SDK) contains the complete set of class files for all the Java Technology packages, which includes basic language classes, GUI component classes, and so on.

2. The other Main Deployment Environment is on your web browser. Most commercial browsers supply a Java technology interpreter and runtime environment