The document discusses the logical fallacy known as ad hominem. It defines ad hominem as attacking an argument by attacking the person making it rather than addressing the substance of the argument. The document provides several examples of ad hominem, such as dismissing a doctor's advice because of their weight or rejecting a movie review because of the reviewer's religion. It emphasizes that arguments should be evaluated based on evidence and reasoning rather than personal characteristics. The document is intended to help readers identify and avoid ad hominem fallacies.