You can choose between three installation packages.

Windows: The Windows installer provides an IBM JRE for Windows that you can use to run . This is a quick, native installer for a user that does not have any previous knowledge or experience with Java. The Windows installer has a footprint of approximately 60M.

Linux: The Linux installer provides an IBM JRE for Linux that you can use to run . This is a quick, native installer for a user that does not have any previous knowledge or experience with Java. The Linux installer has a footprint of approximately 70M.

Java: The Java installer does not include a JRE and has a smaller footprint of approximately 15M. It provides a consistent method of installation across multiple platforms. You can run the Java installer on any operating system, including Windows and Linux. The Java installer requires that you already have JVM version 1.3 or later installed on your system.

If you are using the Java installer and do not already have a JVM installed, you should contact a JVM vendor for your operating system.

A JRE (Java runtime environment) is a subset of the components included in a Java Developer Kit. A JRE contains a JVM and provides the ability to run Java applications. However, JREs do not include the tools and utilities necessary to develop applications. If you are planning to develop applications, you should install a Java Developer Kit.