A ledger is a book or database in which double-entry accounting transactions are stored and summarized. This ledger is the central repository of information needed to construct the financial statements of an organization.
In a manual bookkeeping system, each page in a ledger is typically assigned to a single account; pages are added if the number of recorded transactions for an account exceeds the assigned page. In a computerized environment, a ledger is simply a file containing the same information that would have been found on a ledger page in a manual system.
A ledger is sometimes referred to as the general ledger, which is the aggregate set of records covering all accounts for which a business stores transactional information.