A referral ID is a unique code or link that is used to track a referral from one person to another. In the case of Binance, a referral ID is used to track referrals from one user to another when signing up for the Binance exchange.
If you have a friend who is already using Binance and they want to give you a referral link or code to sign up, they can provide it to you. Once you use that referral link or code to sign up for Binance, the person who referred you will be able to earn a commission on your trading fees.
Binance referral ID: JNDPUN2D