Explanation:

A ledger  is a book or collection of accounts in which account transactions are recorded. Each account has an opening or carry-forward balance and would record transactions as either a debit or credit in separate columns and the ending or closing balance.
The ledger is a permanent summary of all amounts entered in supporting journals which list individual transactions by date. Every transaction flows from a journal to one or more ledgers. A company's financial statements are generated from summary totals in the ledgers.

Ledgers include:

• Sales ledger, records accounts receivable. This ledger consists of the financial transactions made by customers to the company.
• Purchase ledger records money spent for purchasing by the company.
• General ledger representing the five main account types: assets, liabilities, income, expenses, and capital.
• For every debit recorded in a ledger, there must be a corresponding credit so that the debits equal the credits in the grand totals.