"A fallacy is incorrect argument in logic and rhetoric resulting in a lack of validity, or more generally, a lack of soundness. Fallacies are either formal fallacies or informal fallacies." from Wikipedia.
[caption id="attachment_633" align="aligncenter" width="630"] Logical fallacies Poster[/caption]
[caption id="attachment_590" align="aligncenter" width="550"] Taxonomy of Logical Fallacies Poster[/caption]
A logical fallacy is a flaw in reasoning. A master debater will explicitly refute the central point, and nothing more.