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what's meaning of last_lsn?

liyxliyx EntrantCurrent User Role Beginner
When i use innobackup to backup my database.It will write database's checkpoint to file named xtrabackup_checkpoint.In the file ,i don't know the meaning of last_lsn .
What is difference of last_lsn and to_lsn? Where can i use it?
Please help me!

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