Almost all open source Java software is designed to run with Java SE. There are two different Java SE packages that can be installed: the Java Runtime Environment (JRE) and the Java Development Kit ...

The Java Runtime Environment (JRE) is a software package developed by Oracle Corporation. It's designed to provide a runtime environment for applications written in Java programming language.

Javaw.exe is an executable component integrated within the Oracle Java Runtime Environment (JRE). It is essential to run certain Java-based programs including JAR files without using a console window.