👉 The by-project, also known as a by-product or secondary product, refers to an unintended but valuable outcome generated during the primary production process of a project or industry. These by-products can be utilized for various purposes, such as raw materials for other processes, energy generation, or even new products. For instance, in biofuel production, glycerol, a by-product of biodiesel manufacturing, can be used in pharmaceuticals or cosmetics. The by-project concept highlights the potential for maximizing resource efficiency and sustainability by finding additional value from what might otherwise be discarded.