JAVA_HOME is an operating system (OS) environment variable which can optionally be set after either the Java Development Kit (JDK) or the Java Runtime Environment (JRE) is installed.

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

After you install Java and the JDK on Ubuntu, it's customary to set the JAVA_HOME environment variable as well. To do this, simply edit the user's environment configuration with the following command: ...