The Java 2 Runtime Environment (also known as Java Runtime or JRE) consists of the Java Virtual Machine, the Java platform core classes, and supporting files. It is the runtime part of the Java 2 Development Kit, but without the development tools such as compilers and debuggers. The Windows version of the JRE is packaged with the Java Plug-in, a software product that enables Web browsers to use JRE 1.2 to run 1.2 (Java 2)-based applets.
Version 1.4 builds upon Java technology's cross-platform support and robust security model with new features and functionality, enhanced performance and scalability, and improved reliability and serviceability.
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