I was browsing through Quora (what Yahoo! answers used to be before everyone discovered it) and found an interesting answer to the question what the difference between UI and UX. I love the answer so much I had to blog it here. The original explanation can be found here for reference sake.
This is UI design:
How you interact with the toilet.
This is UX design:
How you experience the toilet.
Simple to understand!
Of course there are more practical explanations between the two but it’s just not the same.