The definition of a reactive approach is one that focuses on responding to changes in the environment or to external stimuli. This type of approach is often used in the fields of engineering, software development, and other areas of technology. It is based on the idea that a system should be able to react to changes in its environment in order to remain stable and efficient. In software development, for example, a reactive approach would involve writing code that can respond to user input and adapt accordingly. This type of approach is often used in the development of interactive applications, where the user’s input can trigger a response from the application. Reactive approaches are also used in the fields of robotics and artificial intelligence, where the goal is to create machines that can respond to their environment in an intelligent manner. Ultimately, a reactive approach is one that focuses on responding to changes in the environment or to external stimuli in order to remain stable and efficient.