Difference between .on('click') vs .click()

Question

Is there any difference between the following code?

$(\'#whatever\').on(\'click\', function() {
     /* your code here */
});

and

Answer 1

As far as ilearned from internet and some friends .on() is used when you dynamically add elements. But when i used it in a simple login page where click event should send AJAX to node.js and at return append new elements it started to call multi-AJAX calls. When i changed it to click() everything went right. Actually i did not faced with this problem before.