Can someone help explain the Slot A and Slot B stuff in TWRP?

How to Check and Change Current Active Slot on Android [Fastboot twrp slot a slot b
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lottery sambad yesterday result Thread AB slot issue, TWRP only on one unrooted rom on other Can't mount from TWRP TWRP is on slot B but not slot A I can only reboot to system from TWRP