What's the purpose of A and B partition slots if both are flashed?

How To Port TWRP To AB Partitioned Devices Running Android 10 And 11 (MediaTek

My device is indeed in a temporary TWRP flash

k slot slot? 04:41 - Como descobrir o slot ativo atualmente? 05:34

toto slot 771K views · 14:53 Go to channel · How to Check and Change Current Active Slot on Android