As we continue our series on companies that built the world, we look at the history of one of the most valuable companies in the world: ExxonMobil. Known as part of "Big Oil" along with Chevron, Royal Dutch Shell, Total SE, and BP, ExxonMobil makes up a large percentage of the oil industry around the world.

In addition to the long history of Exxon, started way back with John D. Rockefeller, we also explore how Exxon has used engineering and technology to improve their techniques and keep costs down (or profits up?).

Sit back and enjoy this quick look at ExxonMobil, and learn how they grew into one of the most valuable companies in the world.