Wikipedia has this to say about Illuminati:
Illuminati (plural of Latin illuminatus, "enlightened") is a name that refers to several groups, both historical and modern, and both real and fictitious. Historically, it refers specifically to the (Bavarian) Illuminati, an Enlightenment-era secret society founded on May 1st, 1776, which was dedicated to the systematic and stealthy conquest of nations, one by one, and ultimately the entire world. In modern times it is also used to refer to a purported conspiratorial organization which acts as a shadowy power behind the throne, allegedly controlling world affairs through present day governments and corporations, usually as a modern incarnation or continuation of the Bavarian Illuminati. In this context, Illuminati is often used in reference to a New World Order (NWO).
But who really are the Illuminati? What is the New World Order? What is their history? What do they have planned for humanity?
Veteran British actor Patrick MacNee narrates the history of the illuminati and reveals their plan for world domination in this interesting and informative documentary. (Duration: Approx. 1 hour)