$,ajax() allows to make an ajax call.

This method provide more control than any other method.

In the ex below all the parameters  and comment related to each parameter describe the purpose of each one.

var ajaxUrl = "Json.htm";
            $("#btnAjax").click(function () {
                $("#dvAjax").html(ajax_load);


                $.ajax({
                    type: "GET", 		//GET or POST or PUT or DELETE verb
                    url: ajaxUrl, 		// Location of the service
                    data: "", 		//Data sent to server
                    contentType: "",		// content type sent to server
                    dataType: "json", 	//Expected data format from server
                    processdata: true, 	//True or False
                    success: function (json) {//On Successful service call
                        var result = json.name;
                        $("#dvAjax").html(result);
                    },
                    error: ServiceFailed	// When Service call fails
                });

                return false;
            });

Important

It provide more control on data sending and response.

It allows to handle error occur during call.

It allows to handle data if the call to the page is successful.