Exxon Mobil Corporation is the largest publicly owned oil and gas exploration, development and production company in the world, as well as the world's largest fuel refiner and manufacturer of lubricant basestocks used for making motor oils. ExxonMobil's affiliates have refining operations in 26 countries, 42,000 retail service stations in more than 100 countries and lubricants marketing in almost 200 countries. Consumers know ExxonMobil best by brand names: Exxon, Mobil and Esso.