Bank books are important documents that record the financial transactions of an individual or an organization. These books are also known as "ledger books." They are used to maintain accurate records of a person's or a company's income and expenses. Other synonyms for bank books include "accounting books," "financial ledgers," and "balance sheets." These synonyms all refer to the same type of records, yet each of them may denote a slightly different perspective or level of formality. Regardless of their name, bank books serve as a crucial tool for managing finances, tracking expenses and profits, and providing an overview of one's financial standing.