User Interfaces (UI)
The technical definition of a User Interface (UI) is the “space where interactions between humans and machines occur.” (from Wikipedia)
More simply put, the User Interface (UI) represents the elements on the screen that our users will interact with to execute the “calls to action” such as playing and pausing a video, to navigating the screens, to completing activities or questions.
A poorly thought out and designed User Interface can break the user’s experience before they’ve even started.
Starting with buttons for example. If a button is placed on the screen in a location where it is not expected, this can lead to confusion. Even icons not matching the design of what a typical icon would look like, say a home icon or menu icon.
All these subtle design elements make up the User Interface (UI), which in turn drives the User Experience.
In the following article Connie Malamed does a great job in highlighting the practical considerations and approach to UI design.