A bun is a small, individually portioned bread roll, typically yeast-leavened and made from wheat flour, water, and often milk, eggs, sugar, or fat, giving it a soft, slightly sweet crumb. Buns can be savory or sweet and are shaped round, oblong, or braided; they serve as the base for handheld foods like hamburgers, sliders, and sandwiches, as well as sweet items like cinnamon rolls. Texture varies with recipe, from soft and pillowy to lightly crisp on the outside, and different cuisines have their own styles, from Western dinner rolls to Chinese steamed buns.