Zweihander is mostly a video game term for the type of weapon. Historically, in Germany, beidhänder was more likely to be used. Other places had other terms for essentially the same type of weapon. Montante in Spain, or Spadone in Italy. But they’re all essentially the same. Massive swords that require two hands to use and become so large techniques become quite different from longswords. We often see references in texts that describe them as used for crowd control or breaking through spear formations.