Interaction Design (IxD) is the design of interactive products and services in which a designer's focus goes beyond the item in development to include the way users will interact with it. Thus, close scrutiny of users' needs, limitations and contexts, etc. empowers designers to customize output to suit precise demands. The goal of interactive system design can be analyzed from the two levels of "usability" and "user experience", focusing on people-oriented user needs.
Interaction design belongs to a broad discipline, mainly divided into human-computer interaction, multimedia design and graphic design content with visual expression such as UI and web interface.