What is the volatile keyword in Java for? Explain with examples

Hello everyone! I'm a beginner Java developer and have been actively studying multithreading recently. I came across the `volatile` keyword, but I don't fully understand why it's needed and when to use it. I wrote a small piece of code where one thread changes the `running` flag, and another thread checks it in a loop. Without `volatile`, the program sometimes works incorrectly — the second thread doesn't see the change and continues running. Here's my code: ```java public class TestVolatile { private static boolean running = true; public static void main(String[] args) throws InterruptedException { Thread worker = new Thread(() -> { while (running) { // do something } System.out.println("Worker stopped"); }); worker.star