The comments created using /** differ from the ones that use /* because they are interpreted by Javadoc. It is a tool used to generate documentation in HTML format. These special comments are used by Javadoc to create the documentation of our classes. We can add tags with the @ sign. They suggest, e.g., what parameters a method takes or what it returns. We can also use HTML tags. To generate a Javadoc document in IntelliJ Idea, we go to Tools / Generate JavaDoc....

/**
 * The object <code>obj</code> represents an object.
 *
 * @author CPUcademy
 * @version 1.0.1
 */

public class Main {
    /**
     * @param args
     */
    public static void main(String[] args) {
        /**
         * This is the main method.
         */
    }

    /**
     * @param x
     * @return x
     */
    public int method(int x){ return x;}
}