Monetary policy involves central banks using interest rates and money supply to influence economic activity and inflation. The Bank of England pursues monetary policy to meet a 2% inflation target. It uses tools like interest rates, quantitative easing, and forward guidance. Low rates since 2009 have aimed to boost growth but can hurt savers and cause housing booms. The effectiveness of monetary policy faces challenges like debt levels and confidence. There are debates around the costs and benefits of current low rates in the UK.