Difference between Reaction and Response.A reaction is a reverse movement or tendency, or an action in a reverse direction. Reactions are done on impulse, without putting much thought into it or considering what the end result may be. Respond - It can be defined as saying something in reply. Response is more thoughtful and done with reasoning.REACT -It is defined as an act in response to something.to behave or change in a particular way when something happens.A reaction is a reverse movement or tendency, or an action in a reverse direction or manner.Reactions are done on impulse, without putting much thought