What is a check counterfoil and what is it used for?

A check counterfoil is the part of a check that remains attached to the checkbook after a check is written and torn out. It serves as a record for the check issuer, providing details such as the check number, date, payee, and amount. This documentation helps individuals keep track of their expenditures and maintain accurate financial records. Additionally, it can be useful for reconciling bank statements and managing personal budgets.