Overdraft Protection is a financial service offered by banks that helps customers avoid overdraft fees when they spend more money than they have in their checking account. If a customer tries to make a purchase or withdraw cash that exceeds their account balance, the bank will cover the difference, allowing the transaction to go through. This service can be linked to other accounts, such as a savings account or a credit card, to provide funds when needed. While it can be helpful in emergencies, customers should be aware of any fees associated with overdraft protection and manage their accounts responsibly.