User experience

User eXperience (UX) is about how a person feels about using a system*. User experience highlights the experiential, affective, meaningful and valuable aspects of human-computer interaction (HCI) and product ownership, but it also covers a person’s perceptions of the practical aspects such as utility, ease of use and efficiency of the system. User experience is subjective in nature, because it is about an individual’s performance, feelings and thoughts about the system. User experience is dynamic, because it changes over time as the circumstances change.

* In this text, "system" or "product" is used as a general term to refer to a product, service, non-commercial item or a combination of them.