Baking soda is a chemical compound in the form of a white, odorless crystalline powder that stands out for its versatility in cooking, especially in baking and pastry making. This ingredient is known for its ability as a leavening agent, which means it helps to aerate and increase the volume of doughs. When added to recipes, it reacts with acidic ingredients, producing carbon dioxide, resulting in a lighter and airier texture. In addition to its role as a leavening agent, it also acts as an acidulant and acidity regulator, making it useful in various preparations.