What are Service Design, CX, UX, and UI in the age of human-centric problem-solving?

If you are familiar with Design Thinking, technology development and creative problem-solving, chances are you have heard of one of these design disciplines: Service Design, Customer Experience (CX) Design, User Experience (UX) Design, and User Interface (UI) Design. So what are they? And what are the differences and similarities among them?

The definition

According to Forrester, User experience (UX) primarily focuses on the design and development of…