What is the setting of Science Fiction and Fantasy Literature by ?

One of the most important choices Science Fiction and Fantasy authors make when creating stories is the setting. Because most Science Fiction and Fantasy works involve "rules" established through generations of other writers—such as Asimov's famous "Three Laws of Robotics"—the choice of a setting can introduce potential constraints. While writers sometimes bend or break those rules, deviating from them requires the formulation of a convincing and compelling alternative.