What is the role of Archiver [ARCn]? - oracle

What is the role of Archiver [ARCn]?

ARCn is an oracle background process responsible for copying the entirely filled online redo log file to the archive log. Once these files have been copied, they can be overwritten. The n in ARCn represents the sequence number of the archiver process. A single oracle instance can have 10 (ARC0 to ARC0) archiver processes associated with it. ARCn process is however, only activated when the database is running in ARCHIVELOG mode and the LOG_ARCHIVE_START initialization parameter is set to true.
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