Double-Entry Accounting is an accounting system that requires each financial transaction to have at least two entries, with equal but opposite effects. This means that for every debit entry there must be a corresponding credit entry, and vice versa. At the end of an accounting period, the sum of all debits and credits should match. Double-Entry Accounting is based on the principle of duality, where each transaction has two components that offset one another. This approach helps ensure accuracy and reliability in accounting records and provides assurance to investors and auditors that the numbers are correct.