Aburaage (油揚げ) is deep fried tofu, sliced thin. It can be found in Asian grocery stores, sometimes in the frozen section.
Aburaage should not be mistaken for inarizushi no moto, or inari sushi skins, which is prepared aburaage made for sushi.
When cooking with it, you should first boil some water and cook the aburaage for a few minutes, then drain. This will help remove excess oil, which is especially important if you’re adding it to soups!
You'll need to buy this at your local asian market.