What is logic?

Logic is the study of how we make inferences, using information we have to produce information we do not have. For Aristotle, the inventor of logic, human beings are rational animals and have the same capacities to respond to experiences that animals have. But humans are also rational beings, capable of using reason to infer the future consequences of current and past situations. Being rational means accepting the responsibility of putting actions and situations into frameworks that make reliable inferences possible. The inferential patterns of classical logic are now embedded within the language of business, jurisprudence, and government. And the inferential patterns of modern logic provide the basis for information technology, including computer science, genetics, and probability theory.