What is a cavity closer?

I have one in my build but i dont know why its there or what it does. Does anyone know?
 

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Yep. So an external wall doesn't join an internal wall leading to moisture issues. Normally in the garage where the back wall runs into the house (if that makes sense). They leave a gap the width of the cavity, and put a "closer" over.

It is normally closed over with painted weathertex scribe or hardwood.
 
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