30 Phil, Chapter 9, Aristotle, Touchstone 26: Logical Fallacies.

A logical fallacy is a flaw in reasoning that invalidates an argument. In simple terms, it’s when a conclusion doesn’t logically follow from its premises. They sidestep issues with a lack of valid argumentation. While using a fallacy doesn’t mean the conclusion is wrong, it does indicate that a valid argument has yet to be made. In “Sophistical Refutations,” Aristotle discusses various kinds of fallacies, including those that occur in language and those that are more about the process of reasoning itself.