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In double-entry accounting, both sides of any transaction have to balance, as the transaction in Figure 16-1 shows. When you move money between accounts, you increase the balance in one account and decrease the balance in the other—just as shaking some money out of your piggy bank decreases your savings balance and increases the money in your pocket. These changes in value are called debits and credits. If you commit anything about accounting to memory, it should be the definitions of debit and credit, because these are the key to successful journal entries, accurate financial reports, and understanding what your accountant is talking about.