Fresh yeast, also known as baker's yeast, is a living organism that is used as a leavening agent in baking. It is a key ingredient in bread making, helping dough to rise and develop a light, airy texture. Fresh yeast has a moist and crumbly texture, with a slightly sweet and tangy flavor. It is highly perishable and should be stored in the refrigerator to maintain its freshness. When using fresh yeast in recipes, it is important to activate it by dissolving it in warm water or milk with a bit of sugar before adding it to the rest of the ingredients. Fresh yeast is preferred by many bakers for its superior leavening properties and ability to produce a distinct flavor in baked goods.