Budgetary control is a technique used by businesses to control costs and maximize profits through planning and comparing actual performance to budgets. It differs from standard costing in that standard costing sets predetermined costs for manufacturing a product, while budgetary control establishes budgets for all incomes and expenditures of a business based on past performance adjusted for future trends. Budgetary control involves establishing budgets, continuously comparing actual to planned performance, and taking corrective actions for any deviations.