Downstream companies are businesses involved in the final stages of the oil and gas industry. They focus on refining crude oil into usable products, such as gasoline, diesel, and jet fuel. These companies also handle the distribution and marketing of these products to consumers and businesses. Examples of downstream activities include operating refineries, managing petrol stations, and selling lubricants. Major downstream companies often work closely with upstream companies, which are responsible for exploring and extracting crude oil and natural gas. This collaboration ensures a steady supply of products for the market.