What is the Easy Button Technique?

When using two buttons use two different class names on the >a> elements

"<a class='QBU_Button1 Vibrant Success' " &
"<a class='QBU_Button2 Vibrant Success' " &

and detect the click events using corresponding classes in the code:

  $("a.QBU_Button1").on("click", function(event) {
  $("a.QBU_Button2").on("click", function(event) {