A fallacy is a flaw in reasoning that invalidates an argument, making it logically unsound. Fallacies often appear persuasive but are based on faulty premises or erroneous reasoning. They can be categorized into formal and informal fallacies, depending on whether the error is related to the structure of the argument or the content. A fallacy is an argument that uses flawed logic to convince someone of something. Fallacies can be based on incorrect information or reasoning. The I decided to choose is tu quoque fallacy A logical fallacy is a flaw in reasoning. Logical fallacies are like tricks or illusions of thought, and they’re often very sneakily used by politicians and the media to fool people.