A polite phrase used when providing information or materials to someone, meaning 'for your reference' or 'FYI' (commonly used in writing or email).
ご参考まで、先月の売上データを添付します。
For your reference, I'm attaching last month's sales data.
ご参考までに申し上げますと、会場は駅から徒歩10分です。
For your information, the venue is a 10-minute walk from the station.
この資料はご参考までにご覧ください。
Please have a look at this document for your reference.