A logical fallacy is a flaw in the structure of a deductive argument that weakens the argument. One example of this is something called an Ad Hominem: attacking the person making the argument, rather than the argument itself. Which weakens your argument greatly because it means your claim is run by anger or frustration, rather than logic and reason. Another common example is Slippery Slope: arguing that a certain action or proposition will lead to an undesirable outcome. it is very important to understand these because it helps with arguments and debates so much. You don't want to be naive and agree with everything everyone says. Especially in politics... where these occur more than you'd think.
