Understanding BottomNavigationView, XML menu and drawables

I'm have been trying to understand how to customize the BottomNavigationView by looking at an number of forum threads.
All of them uses an xml menu file located in the resources - menu folder.
These menues in turn referres to xml drawable files, like ic_dashboard_black_24dp.xml, ic_small_dog_white_24dp.xml, ic_home_white_24dp.xml and so on.
The xml files in the othe3r samples are never displayed in any of the samples so the contents of them is unknown.
Are these drawables part of som library or alike that I have to download/install?

In the files I have seen there seem to be a path part with a android:pathData for the actual image.
How are these vector strings created?

Best Regards
Peter Karlström
Sweden

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