Fiscal policy involves a government adjusting its spending and tax rates to influence economic goals like unemployment and inflation. It works alongside monetary policy to steer a country's economy. Fiscal policy is based on John Maynard Keynes' theory that government spending and tax changes impact productivity, inflation, employment, and currency value. While useful for stimulating a stagnant economy, excessive fiscal changes can also cause issues like high inflation or unemployment. Governments must balance these risks to stabilize economic cycles.