A bread maker is a machine that automatically mixes, ferments, and bakes various types of bread after placing ingredients according to the requirements of the machine. It can be divided into household and commercial use. The bread making mechanism mainly involves three processes: kneading, fermentation, and baking. The principle of a bread maker is to use a built-in computer program to solidify the three processes of making bread, and issue commands to knead, ferment, or bake at a fixed time point, in order to make bread.