A budget is an estimation of revenue and expenses over a specified future period and is usually compiled and re-evaluated on periodic basis. Budgets can be made for a person, a group of people, a business, a government, or any other entity that makes and spends money. This allows a business to see if it will be able to continue operating at their expected level with projected incomes and expenditures. A budget is drawn up for a financial year and contains information about anticipated sales and associated business costs within that period. By using budgeting, a business predicts how well it will perform over the course of a year so that actual performance can be weighed against the original plan.