What is the purpose of yeast in a recipe?

* Leavening agent: Yeast produces carbon dioxide gas, which causes dough to rise and become fluffy.

* Flavor: Yeast imparts a characteristic yeasty flavor to bread and other baked goods.

* Alcohol: Yeast converts some of the sugars in dough into alcohol, which evaporates during baking. This process contributes to the flavor and texture of bread.

* Nutrition: Yeast is a good source of protein, B vitamins, and minerals, including iron, zinc, and selenium.