Accounting is a systematic way to record transactions. An account (in bookkeeping) refers to assets, liabilities, income, expenses, and equity, as represented by individual ledger pages, to which changes in value are chronologically recorded with debit and credit entries. These entries, referred to as postings, become part of a book of final entry or ledger. Examples of common financial accounts are cash, accounts receivable, mortgages, loans, PP&E, common stock, sales, services, wages, and payroll.