A specialized accounting book for accumulating and posting business transactions into specific categories is a ledger.
A ledger is a specialized accounting tool. It can also be described as a financial book or computer program.
In the ledger, information from accounting journals is accumulated and posted into specific categories matching the type of accounts.
From the ledger, the trial balance is extracted, which forms the basis for preparing the financial statements that show an entity's financial profitability and position.
Thus, a specialized accounting book for accumulating and posting business transactions into specific categories is a ledger.
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