The user interface is the graphical, haptic or acoustic surface with which a user interacts with a product. In most cases, user interface refers to the graphical user interface of a website, app, or similar. Acoustic user interfaces are used in voicebots, for example, where a user communicates with the software via voice input.

A user experience describes the interactions and the experience of a user with a product or service. Service design always works to holistically improve the user experience of a service so that customers enjoy using a service or service product intuitively and often.

A user story formulates the user's requirements for a digital product. Based on the user stories, programming teams can come up with suitable technical solutions for the formulated need. Thus, a user story bridges the gaps between user experience and technical requirements.