Yeast bread refers to breads leavened by yeast. Saccharomyces cerevisiae is the most commonly used yeast and reacts by fermenting the carbohydrates present in the flour. The dough for yeast bread is prepared by mixing flour, salt, water and yeast, once the dough is ready it is allowed to rise for 2-3 times â€“ longer the rising time better the flavor. These loaves are then baked in the oven. Some bakers employ the pre-ferment process where the flour, water and yeast are mixed a day before baking and allowed to ferment overnight.