The reactive machine type is the most basic variety of AI. It merely reacts to current scenarios and cannot rely on upon taught or recalled data to make decisions in the present. Reactive machines do away with maps and other forms of pre-planning altogether and focus on live observations of the environment. They are given specific tasks and don’t have capabilities beyond those duties. They’re what you’re most likely to see when witnessing a robot playing a game, like chess, against a human. But reactive machines don’t interact with the world, so they respond to identical situations in the same ways every time those scenarios are encountered.