Robots and Empire is a science fiction novel written by the American author Isaac Asimov and published by Doubleday Books in 1985. It is part of Asimov's Robot series, which consists of many short stories (collected in I, Robot, The Rest of the Robots, and The Complete Robot) and several novels (The Caves of Steel, The Naked Sun, and The Robots of Dawn).
Robots and Empire is part of Asimov's consolidation of his three major series of science fiction stories and novels: his Robot series, his Galactic Empire series and his Foundation series. (Asimov also carried out this unification in his novel Foundation's Edge, and its sequels, thus unifying the three series of fiction into a single future history).
In the novel, Asimov depicts the transition from his earlier Milky Way Galaxy, inhabited by both human beings and positronic robots, to his Galactic Empire. The galaxy of his earlier trilogy of Robot novels is dominated by the blended human/robotic societies of the fifty "Spacer" planets, dispersed over a wide part of the Galaxy. While the Earth is much more populous than all of the Spacer planets combined, its people are looked down upon by the Spacers and treated as second-class citizens. For a long time, the Spacers have forbidden emigration of people from the Earth. But Asimov's later Galactic Empire is populated by many quadrillions of human beings on hundreds of thousands of habitable planets; and by very few robots (such as R. Daneel Olivaw). Even the technology to maintain and upgrade robots exists on only a few out-of-the-way planets. (R. Daneel Olivaw undergoes some of these upgrades, especially to his positronic brain, over a period of more than 10,000 years.) Therefore, Asimov's novel attempts to describe how his earlier Robot series ultimately connects to his Galactic Empire series.