Answer
The cash book records all receipts and payments of cash and through the bank. It is both a book of prime entry and the ledger account for cash and bank, with debit entries for money received and credit entries for money paid. It may have separate columns for cash, bank, and discounts.
Cash Book (two-column):
Debit (receipts): Cash | Bank
Credit (payments): Cash | BankReal-world example Every cheque paid and received is entered in the cash book, which doubles as the bank ledger account.