Cycle Redundancy Check.
It's basically a throw-back to pre-2003 fansubs. Before BitTorrent, we had no way of know whether or not a download completed successfully and without corruption. CRC is nothing more than a hex value assigned to any given file. If your file's CRC doesn't match the CRC on the label, your download is corrupted or incomplete.
You can calculate it using programs like HashCalc and QuickSFV (not sure what other people use).
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