User Experience (UX)

UX primarily studies the behavior, feelings, perceptions, reactions, emotions and other psychological constraints that may occur with a computer or computing enabled device or application. UX is the core of human computer interaction (HCI) technologies. It is also the key job role of a UX designer.

Although it is a broad concept, UX generally focuses on the visual appearance of a system and how it affects the end user in terms of visual gratification and system usability and efficiency in completing system-specific tasks and processes.

User acceptance test (UAT) is a software testing technique that evlautes the UX of the tested software/application.