Many baked goods contain yeast, a single-cell organism that converts its source of nutrition — starch and sugar — into alcohol and carbon dioxide through fermentation. Yeast ferments the sugars in the flour used in baked goods to release carbon dioxide, and the expansion of the gas causes the dough to rise or inflate. The result is the light, fluffy texture for which bread, rolls, and other similar baked goods are known.  Baking yeast is available in two main forms, which are fresh yeast and active dry yeast. Fresh yeast is made of yeast cells compressed into small square cakes that contain 70% moisture content. Active dry yeast is an effective alternative that has a longer shelf life. Instant yeast is another form of active dry yeast that can be added directly to other ingredients, while active dry yeast is dormant until you proof it, which occurs when dissolved in lukewarm water.  Whether you're looking for a tasty treat to enjoy after your favorite meal or you're shopping for bread to complement a new recipe, baked goods are always a welcome addition to your shopping list. Use Instacart to get fresh baked goods from local retailers in your area, delivered straight to your door for the ultimate in convenience. You can also schedule a pickup of baked goods, often ready within 2 hours or less.