JQuery Keydown, Keypress and Keyup Event

Difference between JQuery Keydown, Keypress and Keyup Event

First Keydown Event occurs (Triggers as soon as key is press)
Second Keypress Event occurs (Triggers when key character is typed)
Third Keyup Event occurs (Triggers when key is up, after it is been pressed)

$(document).ready(function () {
        $("#txtInput").keypress(function (event) {
                if (event.which == 64) {
                    alert("You have pressed @ sign");
                }
                else if (event.which == 35) {
                    alert("You have pressed # sign");
                }
                else if (event.which == 36) {
                    alert("You have pressed $ sign");
                }
                else if (event.which == 42) {
                    alert("You have pressed * sign");
                }
                else if (event.which >= 65 && event.which <= 90) {
                    alert("You have pressed uppercase alphabet character");
                }
                else if (event.which >= 97 && event.which <= 122) {
                    alert("You have pressed lowercase alphabet character");
                }
       });
});