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What’s the name of the certain function

Hi, i want to easily implement this into my app, al though, what is it called?

https://drive.google.com/file/d/1h-hWLMRhy69vmdHZLnUjegFFomgodTki/view?usp=drivesdk

This is a tableview with each cell being a collectionView

Checkout this video

Thank you!!!