Saccharomyces cerevisiae, commonly known as yeast, is the type of microbe used in the production of bread. Yeast plays a crucial role in the process of bread making, as it helps in the fermentation of the dough. During fermentation, yeast breaks down the sugars present in the dough and produces carbon dioxide gas as a byproduct. The gas gets trapped in the dough, causing it to rise and expand. This expansion creates air pockets in the bread, resulting in a fluffy and light texture. Therefore, Saccharomyces cerevisiae, or yeast is the microbe responsible for the production of bread.