I only know of three, so maybe someone else will be able to give you the fourth one:
The leveling agents such as baking powder/soda in quick breads and in normal breads, the yeast 2nd answer: That should be 'leavening agents'.
Leavening agents are the ingredients that make the baked goods rise so they are light and airy. It could be yeast, baking soda, or baking powder. Sometimes in cakes, the eggs are whipped into a froth to add air to the cake and this acts as a leavening agent.
Quick breads such as muffins, unlike yeast breads, can be baked immediately after the ingredients are mixed. In other words, there is no need to wait for leavening to occur before baking the muffins because they rise during baking. Therefore, they are relatively quick to make. Yeast breads on the other hand require a lot of time for leavening before baking and are much more time consuming.Source: "Understanding Food" by Amy Brown
Quick bread is any bread leavened with leavening agents other than yeast or eggs. ... Quick breads include many cakes, brownies and cookies—as well as banana bread, beer bread, biscuits, cornbread, muffins, pancakes, scones, and soda bread.
Baking soda produces gas for leavening when combined with acidic ingredient such as vinegar, lemon juice, or molasses. The volume of quick breads, cookies, cakes, and some candies depend largely on the amount of baking soda added to the batter or dough. Reducing the amount of baking soda without replacing it with another leavening agent (Baking Powder, Yeast, and Cream of Tartar are leavening agents) will reduce the volume and lightness of the finished product.
The quickest way to make bread without the need for rising time is to make a type of bread called "quick bread." Quick breads use baking powder or baking soda as leavening agents instead of yeast, so they can be baked immediately after mixing the ingredients.
A quick bread is a type of bread that is leavened with baking powder or baking soda instead of yeast. It is called "quick" because it can be made quickly without the need for time-consuming proofing or kneading. Quick breads include items like muffins, scones, and banana bread. The main difference between quick breads and other types of bread is the leavening agent used and the lack of yeast, which gives quick breads a different texture and flavor compared to traditional bread.
They are chemical (non-yeast) leavening agent usually used in quick breads, cakes and cookies.
Baking powder is used as leavening in baked goods such as cookies, cakes, quick breads, biscuits and pancakes. It creates gas in the batter that causes the product to rise.
A few quick breads are biscuits, banana bread, and cornbread.
YeastGlutenBake
because breads require flour to make it a bread.