Sourdough or sourdough bread is a bread made by the fermentation of dough using wild lactobacillaceae and yeast. Lactic acid from fermentation imparts a sour taste and improves keeping qualities.
Sourdough
Sourdough starter
Bubbly active starter
Mixing bread using sourdough starter
Bread is a staple food prepared from a dough of flour and water, usually by baking. Throughout recorded history and around the world, it has been an important part of many cultures' diet. It is one of the oldest human-made foods, having been of significance since the dawn of agriculture, and plays an essential role in both religious rituals and secular culture.
Various leavened breads
Woman baking bread (c. 2200 BC); Louvre
Brown bread (left) and whole grain bread
Dark sprouted bread