What is the purpose of different Android partitions

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-- Boot partition stores the Android kernel. If this partition is empty, the LK bootloader will enter the fastboot mode.
-- System partition contains the Android user interface and all the pre-installed system applications.
-- Data partition contains the user's data- contacts, messages, user installed applications, settings etc..
-- Tombstone partition saves the ramdumps of any sub-system on crash.
-- Cache partition stores the frequently accessed data and application components.
-- Persistent partition stores any "persistent" data which does not get lost even on a factory reset. MAC address as an example.