Interaction design

Interaction design shapes how people act through digital products, services, and systems and how those systems respond. It coordinates behaviors, interfaces, and feedback to make exchanges understandable and usable.

User interface: The controls and information through which people operate a digital system. It is the visible and interactive surface where designed exchanges take place.
Interaction pattern: A recurring solution to a common design problem in interactive systems. Patterns provide reusable ways to structure familiar exchanges.
Mobile app design: The design of software applications for mobile devices, including their interfaces and behaviors. Small screens and touch input demand distinct interaction decisions.
Donald Norman: An American cognitive scientist and design researcher known for work on usability and human-centered design. His writing popularized concepts such as affordances and feedback in design.
User experience design: The design of a person's overall experience with a product, service, or organization. It covers the broader experience in which designed interactions occur.
Affordance: A quality of an object or interface that suggests or enables a possible action. Controls need to communicate which actions they make possible.
Direct manipulation: An interface approach in which users act directly on visible objects and receive immediate feedback. It makes actions and their effects perceptible within the interface.
Conversational user interface: An interface that lets people interact with a system through natural-language dialogue. Dialogue creates interaction flows beyond conventional visual controls.
Bill Moggridge: A British designer who helped establish interaction design as a distinct design practice. He helped name and institutionalize the discipline in digital product design.
Graphic design: The practice of arranging visual elements to communicate or create an aesthetic effect. It emphasizes visual communication, while interaction design also specifies behavior and response.

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