@karen.wenschhof there was also a similar question about vapor barrier posted awhile back.
You can check out that post at the link below:
Like @coachrebeccasmith said exterior plastic/papers (like in zip systems) and Tyvek, or liquid applied barriers (like in EIFS installation), are all examples of weather barriers. They stop rain from entering the building. The vapor retarder (sometimes called vapor barrier, but more accurately called a retarder) prevents moisture from entering and getting trapped in the wall due to temperature differentials between the exterior and interior, conditioned areas. It’s always installed on the warm face of the wall.
Hope this helps!
-Darion