Interactive systems is a research field focused on the design, analysis, and understanding of systems that engage in dynamic, reciprocal communication with users or environments. It investigates the mechanisms, quality, and impact of this interaction, exploring how information exchange influences system behavior and user experience. Key characteristics include real-time feedback, responsiveness, adaptation, and user agency within the interaction loop. The significance of this concept lies in its fundamental role in developing effective, usable, and contextually appropriate technologies and interfaces across diverse application domains.