noun, suffix
Used as a noun meaning a recorded document or data, and as a suffix in compounds like 録音 (recording) or 記録 (record).
記録 is the more common word for 'record' as a general noun; 録 is often used as a suffix or in formal contexts.
The kanji 録 means 'record' or 'copy'. The reading ろく is the on'yomi. The word is used in compounds and as a standalone noun.