"Reactive" refers to a response or action that occurs as a result of an external stimulus. In various contexts, such as chemistry or psychology, it describes how entities respond to changes in their environment. For example, a chemical reaction occurs when substances interact, producing new compounds. In everyday life, being reactive can mean responding quickly to situations, often without much thought. For instance, a reactive person might react emotionally to criticism instead of taking time to reflect. This can lead to impulsive decisions, highlighting the importance of being mindful and proactive in managing responses.