Counterfoils are duplicate receipts, stubs, or vouchers that act as proof of a transaction. They are often removed and kept by a user for record-keeping purposes. Synonyms for counterfoils include duplicate receipts, stubs, vouchers, check copies, transaction receipts, and carbon copies. These synonyms refer to different forms of counterfoils, but they all have the same purpose of providing evidence of a transaction. Duplicate receipts are typically used for purchases, while vouchers are commonly used for utility payments. Check copies and transaction receipts are often associated with financial transactions. Regardless of the specific terminology used, all of these synonyms refer to similar types of proof of transactions.