So, you have a Fire-type. Let's say Litleo. The opponent has a Surskit, a Bug-Water type. You use a Fire-type move. Would it be super effective (Bug type,) or not very effective (Water type?)
It would be neutral. Fire does 2x damage against Bug-types and 0.5x against Water-types, so it cancels out to become 1x.
Source: Knowledge