The user is often the focus of interaction with their device, and the interface entails components of both hardware and software. User input allows for the users to manipulate a system, and device’s output allows the system to indicate the effects of the users’ manipulation.
The application can be geared either to business users (such as an accounting application) or to consumers (such as an application for storing and sharing personal data).
Mobile UI design constraints include limited attention and form factors, such as a mobile device’s screen size for a user’s hand. Mobile UI contexts signal cues from user activity, such as location and scheduling that can be shown from user interactions within a mobile application.
Overall, mobile UI design’s goal is primarily for an understandable, user-friendly interface. Mobile UIs, or front-ends, rely on mobile back-ends to support access to enterprise systems. The mobile back-end facilitates data routing, security, authentication, authorization, working offline, and service orchestration. This functionality is supported by a mix of middleware components including mobile app servers, Mobile Backend as a service (MBaaS), and SOA infrastructure.