Interaction designers craft meaningful user journeys by defining how people interact with digital components, systems, and services. They prototype interactions, design navigation structures, refine micro-interactions, and collaborate with user researchers and engineers. Their work spans apps, websites, embedded interfaces, wearables, AR/VR systems, and connected environments. They integrate design principles, cognitive science, and behavioural insights to deliver seamless user experiences. As global adoption of digital interfaces accelerates, interaction design remains essential for producing accessible, coherent, and human-aligned technologies.