Feedstocks are raw materials used to produce energy, chemicals, or other products. They can come from various sources, including plants, animals, and fossil fuels. Common examples of feedstocks include corn for biofuels, crude oil for petroleum products, and natural gas for electricity generation. The choice of feedstock can significantly impact the efficiency and sustainability of production processes. Renewable feedstocks, like biomass, are often preferred for their lower environmental impact compared to non-renewable options, such as coal or oil. Understanding feedstocks is essential for developing sustainable energy solutions and reducing reliance on finite resources.