Answer
A trial balance is a list of all the ledger account balances at a point in time, with debit balances in one column and credit balances in another. Because of double entry, the total debits should equal the total credits. It's prepared to check arithmetical accuracy and as the starting point for the financial statements.
Trial Balance (extract):
Account Dr Cr
Sales 50,000
Purchases 30,000
Debtors 8,000
Totals must be equal.Real-world example At period end the bookkeeper lists every account balance in a trial balance to confirm debits equal credits.