DTDT: UX is everything not-UI.
“People mix the terms UI and UX together. UX is tricky because it doesn’t refer to any one thing. Interface design, visual styling, code performance, uptime, and feature set all contribute to the user’s ‘experience’. Books on UX further complicate matters by including research methods and development methodologies. All of this makes the field confusing for people who want to understand the fundamentals.”
(Ryan Singer) courtesy of thomasmarzano