User Interface Design focuses on anticipating what users might need to do and ensuring that the interface has elements that are easy to access, understand, and use to facilitate those actions. UI brings together concepts from interaction design, visual design, and information architecture (usability.gov, n.d.).
A brief history:
Keep it simple, Simple UI design means that anyone can have access to very sophisticated applications. When applications are well designed, there is no price for access. You may have to pay for the application, but you don’t have to spend time learning how to use it. Google has given everyone access to unbelievable amounts of information, Amazon to an amazing number of products, and Facebook to virtually everyone on the Internet (Green, 2015). This idea of simplicity as a selling point clashes with the old thinking of constantly adding new features to your product in order to make it more appealing to your customers.
What about the process?
What is the diference of UX and UI? Well
Green, D. (26 October 2015). The Importance of Simplicity in User Interface (UI) Design. einsights. Retrieved from: http://einsights.com/the-importance-of-simplicity-in-user-interface-ui-design/
Usability.gov. (n.d.) User Interface Design Basics. Usability.gov. Retrieved from: https://www.usability.gov/what-and-why/user-interface-design.html