Refining is the process of purifying a substance, often used in industries like metallurgy and oil production. In metallurgy, it involves removing impurities from metals to enhance their quality and performance. For example, the refining of gold separates it from other minerals, resulting in a purer product. In the oil industry, refining transforms crude oil into usable products such as gasoline and diesel. This process includes distillation and chemical treatments to separate and convert various components. The end result is a range of fuels and other products that power vehicles and support various industries.