When a central bank lifts interest rate targets by 0.5% it expects households and firms to respond. In a crisis, the official target may fall by 3% in order to shock the economy into a positive response. These movements of interest rates by the central bank are an important tool of macroeconomic adjustment.
They are also relative to the longer term, or normal rate of interest in the economy. What is interesting now is that rates have been low for quite a long time suggesting the natural rate of interest in the economy has fallen permanently.