The 'Find Coupons' function assist you to search the available coupons your order & account you are eligible to utilize.
The coupons are unique to every customer's cart order & account.
For example, I have added a fitbit watch that is part of a Mother's day promotional campaign(that is offering $30 off) into my cart. Hence, the Find Coupons' function will prompt me that this coupon is available for use.
It's that simple!