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 would be. Response 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.The action is said to done spontaneously without thinking it reasoning.Reactions are done on impulse, without putting much thought into it or considering what the end result