Appeal to Authority

The Appeal to Authority fallacy occurs when a person used a person's position of authority as evidence or an excuse for a position that is undeserving.

For example, if a person were to say "Of course 2+2 = 6, my Geography teacher told me so." In this case, the Geography Teacher has a position of authority, but they are not an authority on the subject at hand, which is math.

On the other hand, citing authorities on a subject is a necessary and good part of making a solid argument, so this fallacy can be tricky to notice.