Why action: "my_action" for wordpress ajax?

Question

CMS

There is code for ajax wordpress

var data = {
      action: 'my_action',
            name: 'hello'
    };

    jQuery.post( myajax.url, data, function(response) {
            var d = document.querySelector('.fm'); 
            d.innerHTML = response;
    });

without action: "my_action" doesn't work, why?

Answer 1

see handlermyajax.url

Answer 2

Read the article on ajax in wp . my_action is the event the hook is hooked on to run the request handling function on the server