difference - Roll forward and roll back

Hi experts, about reading transacton but i do not understand the difference between
Roll forward and roll back
enrique_aeoAsked:
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Rajkumar GsSoftware EngineerCommented:
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mustaccioCommented:
The rollforward process applies to the data files all transactions that are recorded in the log but not marked as applied. In other words, it repeats all changes that have happened to data. The rollback process then unapplies those transactions that are incomplete, that is, undoes the incomplete changes.
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Microsoft SQL Server 2008

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