Soybean is an annual herbaceous plant of the genus Soybean in the family Leguminosae, which is divided into five categories according to the color of the seed coat and the shape of the seeds: yellow soybeans, green soybeans, black soybeans, soybeans of other colors (the seed coat is a single color of brown, brown, russet, etc.) and fodder beans (the seeds are smaller, flat and long oval, and there are sunken dots on the two cotyledons).