What's Package and what's Device?

[BetaTesta]

Hello,

I've been searching but can't find answers.

What's the difference between Ventoy in Package and Ventoy in Device?
What's Package and what's Device?
Why Package has exFAT/MBR and Device has exFAT/MBR (note that I already know what a filesystem and partition table is)?


If I understand Ventoy in Device is partition S: WORKSPACE, am I correct?
Is Ventoy in Package partition T: VTOYEFI ?
   

If so why Ventoy gui says exFAT and File Explorer says FAT as filesystem?