Yes, drop-down menus are a drill-down system, but after the first click, you can see each subsequent menu's drop-down by simply hovering. In a touch-oriented d

Yes, drop-down menus are a drill-down system, but after the first click, you can see each subsequent menu's drop-down by simply hovering. In a touch-oriented drill-down scenario, there's no concept of a hover, so you have to touch once to see every level of the menu.