Mould is also called "filamentous fungus". This is a fungus.

Fungi are widely distributed in nature, with more than100000 species, of which only a small part, about 300 species, can cause human or animal infections. Many fungi are beneficial to human beings, such as flour fermentation, soy sauce, vinegar, wine and moldy tofu. Many enzyme preparations in industry and feed fermentation in agriculture are inseparable from fungi. Many fungi can also be eaten, such as mushrooms, tremella, mushrooms, fungus and so on. Fungi are also valuable resources in medicine, some of which can be used to produce antibiotics, vitamins and enzymes; Some of them can be used as medicine to treat diseases, such as puffball, poria cocos and cordyceps sinensis.

Therefore, moldy tofu can decompose the substances that are difficult to decompose in tofu and form its unique flavor, which is harmless to people when eaten in moderation.