By-products are secondary products that are generated during the manufacturing or processing of a primary product. For example, when producing corn syrup, the leftover material can be used as animal feed. These by-products can often be valuable and serve various purposes, reducing waste and increasing efficiency in production. In many industries, by-products can be repurposed or recycled, contributing to sustainability efforts. For instance, in the paper industry, the leftover wood chips can be used to create biomass energy or composite materials. This not only minimizes environmental impact but also creates additional revenue streams for businesses.