"Appeal to Authority" is a logical fallacy where someone argues that a claim is true simply because an authority figure endorses it. This reasoning assumes that the authority is always correct, which is not necessarily the case. For example, just because a famous scientist like Albert Einstein supports a theory does not automatically make it true without evidence. This fallacy can be misleading, as it may ignore other important evidence or viewpoints. It's essential to evaluate the credibility of the authority and the context of their expertise. Relying solely on authority can lead to flawed conclusions, especially in complex fields like medicine or politics.