Java Runtime Environment (JRE)

Sun Microsystem's execution-only subset of its Java Development Kit. The Java Runtime Environment (JRE) consists of the Java Virtual Machine, Java Core Classes, and supporting files, but contains no compiler, no debugger, and no tools.

The JRE provides two virtual machines: JRE.EXE and JREW.EXE. The only difference is that JREW does not have a console window.