In the end, the JRE is the ghost in the machine. It is the agreed-upon fiction that allows a single .jar file to be a citizen of every operating system. And that fiction has proven more durable than most realities in software engineering.
Imagine you have a script for a play (the ). The script itself is just text on paper. For the audience to enjoy the play, you need a stage, lighting, props, and a director to bring the script to life. what is the java runtime environment