Human Interface Guidelines, HIG
A set of recommendations for designing and developing user interfaces for mobile, desktop, convergent applications and workspace widgets.
User Interface, UI
In the field of human–computer interaction, the User Interface is the space where interactions between humans and machines occur. The goal of this interaction is to allow effective operation and control of the machine from the human end, whilst the machine simultaneously feeds back information that aids the operators’ decision-making process.
User Experience, UX
UX refers to a person’s emotions and attitudes about using a particular product, system or service. It includes the practical, experiential, affective, meaningful and valuable aspects of human–computer interaction and product ownership. Additionally, it includes a person’s perceptions of system aspects such as utility, ease of use and efficiency. User experience may be considered subjective in nature to the degree that it is about individual perception and thought with respect to the system. User experience is dynamic as it is constantly modified over time due to changing usage circumstances and changes to individual systems as well as the wider usage context in which they can be found. In the end, user experience is about how the user interacts with and experiences the product.