The term responsive refers to something that is able to respond or react in a certain way when faced with a particular situation, stimulus or input. In other words, it means being quick and adaptable to changes around you, by providing an appropriate response based on the circumstances at hand. This could involve anything from adjusting your actions according to someone else's needs, to designing a website that automatically resizes its content for different screen sizes. The key characteristic of something responsive is its ability to be sensitive and attentive to what is happening around it, and then react accordingly in real-time.