Fiscal policy is the academic field and economic concept concerned with the use of government revenue and expenditure instruments to influence macroeconomic conditions. It investigates the design, implementation, and effects of taxation, public spending, and debt management on aggregate demand, economic growth, inflation, and employment. Key characteristics include the distinction between discretionary policies and automatic stabilizers, and its significance lies in its role as a primary tool for macroeconomic stabilization, resource allocation, and income redistribution within an economy.