Refining companies are businesses that process raw materials, particularly crude oil, into usable products like gasoline, diesel, and jet fuel. They use various techniques to separate and purify different components of the crude oil, making it suitable for consumer and industrial use. This process is essential for meeting energy demands and producing various petrochemical products. In addition to oil, refining companies may also work with metals, such as gold and silver, extracting and purifying them from ores. These companies play a crucial role in the supply chain, ensuring that essential materials are available for manufacturing and other industries.