“ Look, see those birds? At some point, a program was written to govern them. A program was written to watch over the trees and the wind, the sunrise and sunset. There are programs running all over the place. The ones doing their job, doing what they were meant to do, are invisible. You'd never even know they were here. But the other ones... Well, you hear about them all the time.
”― The Oracle[src]
Matrix controllers described any number of programs and/or machines which were designed to govern the systems within the Matrix. Some programs, like the Agents, manifested their administrative privileges within the Matrix through various powers and superhuman feats.