Exxon is a multinational oil and gas corporation that was founded in 1870. It is one of the largest companies in the world, with operations spanning across over 50 countries. The company's name comes from the combination of "Esso," which stands for the "Standard Oil Company of New Jersey" (one of John D. Rockefeller's Standard Oil companies), and "Xtra." Exxon is known for its production, transportation, and sale of petroleum products, as well as for its chemical manufacturing operations.