You can add a new User Variable, System Variable, edit a Variable, etc. Learn how to use Environment Variable Editor in PowerToys in Windows 11.

A PATH variable stores directory shortcuts. Learn How to add, modify or edit a PATH Environment Variable in Windows 11/10.

JAVA_HOME is an operating system environment variable that directs a user to the file system location where the JDK or JRE was installed.

This environment variable lives on in Windows 10 as a way to tell the system where to look when you try to run a command. Normally, the system looks in the Windows folder and its System32 subfolder.

The default-java folder is a symbolic link to the actual location of the JDK install on Ubuntu. When you reference the JDK install location in applications or in environment variables such as ...

On Windows 7, it's directly accessible through start menu search... search for "Environment variables" (there are separate items for user and system variables, because one requires elevation).