Yeast
Yeast is a single-celled organism that consumes sugar and converts it to ethanol and carbon dioxide gas. Yeast is used in baking to make dough rise and in beverages to create alcohol. Types of yeast used in baking include active dry yeast, quick-rising yeast, and bread machine yeast. The latter two are more active strains of yeast that cut rising time for doughs.
Useful Links:
Baking & Pastry Arts – Culinary Arts (Credo) – LibGuides at Leeward Community College
Fun related videos
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How To Make Soft Palappam with out yeast / Kerala Appam
Source: Salu Kitchen
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Source: MyRecipes
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Source: Hema's HealthyYetTasty recipes
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Source: Beer Geek Nation