Formal FallacyType: Logical Fallacy
The distinction between a Formal and an Informal Fallacy is that a formal fallacy is based solely on logical form, and an informal fallacy takes into account the non-logical content of the argument. This roughly parallels the distinction between deductive and non-deductive modes of reasoning. Typically, formal fallacies occur within deductive contexts, whereas informal fallacies are committed by arguments that could be at best inductively strong. However, there are exceptions to this pattern, for instance Begging the Question.
Robert Audi (General Editor), The Cambridge Dictionary of Philosophy, 1995.