A logical fallacy is a flaw in reasoning that weakens or invalidates an argument, often appearing as an error in logic or a deceptive trick. In contrast, a valid argument is one where the conclusion logically follows from the premises. Valid arguments maintain logical structure in their premises (e.g., A=B, B=C, therefore A=C), whereas fallacies provide irrational arguments through flawed structures or irrelevant content.
When the premises introduced do not provide evidence for the conclusion due to the structure of the argument, that is called a non-sequitur, or a formal logical fallacy. In contrast, informal logical fallacies may have a valid logical structure, but the error is that their content is irrelevant or the premises are fundementally flawed.
Understanding logical fallacies is key for engaging in good-faith debate and creating rational arguments in law, policy, and public discourse. Having a strong command of logical fallacies enables individuals to detect flawed reasoning, defend against manipulation, and improve the quality of their own decisions.
Ready to learn more? Explore our reference articles on logical fallacies.
The Thinking Mind 