Preparing for an exam on handing Exceptions, Why do we need throws?

Question

So I'm just starting to learn about Exception handling and I'm by something in the output of this code, So I wanted to check if I was going to get an arithmetic Exception if I did not "throws" the right class for the exception that will occur in the method num, in this case division by 0 .

public static void num(int k)//throws Exception
 {
         int ll = k /0;
}



public static void main(String [] args)  {
    Scanner in = new Scanner (System.in) ;

    try {
        num(2) ;
    } catch (IllegalArgumentException e) {
    System.out.println(e.getMessage());
    }
    catch (Exception e) {
        System.out.println("Handled");

    }

The exception is still being caught by catch in the main even though I did not use "Throws " in the method num. I'm so confused to why this is happening, What would be the point of throws if I can still handle the exception regardless