When using the oven, it is possible to bake directly without preheating, but preheating is mainly to quickly reach the temperature required for baking. Without preheating, the temperature rises slowly, which makes it difficult to quickly set cakes, bread, etc., and there will be defects such as small size and hard taste when baking.

Oven, also known as oven, oven and oven, refers to a device for cooking food with hot air, which is generally closed or semi-closed. It is called barbecue if it is heated by hot air in an open form. Oven can also be used to refer to a device for high temperature treatment with hot gas. In the west, the oven is a common equipment in the traditional family kitchen, which is generally horizontal. In the Central Plains of China, it is traditionally used in the catering industry rather than at home, and it is mostly vertical. In ancient China, ovens were not popular, which may be caused by the lack of fuel. Traditional ovens use wood and coal to burn and heat. Modern ovens mostly use electric heating or natural gas, and have an automatic constant temperature system.