Sourdough bread, rather than leavened with active dry yeast, is made from a starter of fermented flour, sugar, and water, which supports a culture of natural yeast. Sourdough breads have a distinctive sour or tangy taste.
For other breads, see baguette, bread crumbs, challah, country-style bread, English muffins, French bread, Italian bread, lavash, multigrain bread, pita bread, tortillas, white bread, and whole-wheat bread.