The Java™ Platform, Standard Edition 6 (Java SE 6).
The Java SE Runtime Environment (JRE) allows end-users to run Java applications.
(The previous release was Java 2 Platform, Standard Edition 5.0 (J2SE 5.0)
Java SE Overview
Java Platform, Standard Edition lets you develop and deploy Java applications on desktops and servers, as well as today's demanding Embedded and Real-Time environments. Java SE includes classes that support the development of Java Web Services and provides the foundation for Java Platform, Enterprise Edition (Java EE).
There are two principal products in the Java SE family:
Java SE Development Kit (JDK) and Java SE Runtime Environment (JRE).
• The JRE provides the Java APIs, Java Virtual Machine (HotSpot VM), and other components necessary to run applets and applications written in the Java programming language. It can be redistributed with such applications.
• The JDK contains everything that is in the JRE, plus tools such as the compilers and debuggers necessary for developing applets and applications.
Confused about Java? Read about Java Naming and Versioning
End-users download the Java Runtime Environment (JRE) 6!
Downloads:
http://java.sun.com/javase/downloads/index.jsp