Panko is a type of bread crumb used as a coating. It is made from white bread that has been processed into airy, large flakes. Panko is popular in Japanese cuisine and is often used to coat deep-fried foods such as tonkatsu. It is also used in other dishes such as casseroles and baked fish. Panko has a light, crunchy texture that helps to create a crispier coating than traditional bread crumbs.