Revenue:  Amounts earned by selling its products or providing services to customers, called sales revenue. Other items of revenue common to many businesses are: commission, interest, dividends, royalties, rent received, etc. Revenue is also called income..

Expenses:  Costs incurred by a business in the process of earning revenue are known as expenses. Generally, expenses are measured by the cost of assets consumed or services used during an accounting period. The usual items of expenses are: depreciation, rent, wages, salaries, interest, cost of heater, light and water, telephone, etc.