Actually, UI & UX come together. User Interface, as the word say, presents in lay words, something users see as they open for example application or website - the interface, in the other words, anything user can interact with. Well now, when we observed the UI, in design it's not everything about how it looks. We, as designers, must make user the comfortable place to be - design should be trustworthy, credible & useful.

So when you "compress" all the things of UI and UX which is a bigger story itself, you get a great design.

To explain in more detail, I like to use comparisons. Imagine having a good brand with nice logo and everything and you see that brand for the first time and tell yourself "huh, what a nice company it must be". On the first sight logo might be great, but overall visual identity and for example website, don't give a sense of credibility - which makes you not pull out your credit card for that sick looking t-shirt. That's a bad User experience, which makes you not coming back to that site.

Designers sometimes have to put themselves in psychologist's skin and think few steps forward about the synergy of beauty / attractiveness & the usage / feelings of the design.

For me, it's like beautiful woman with bad habits and bad manners - sorry if I'm too unpleasant. 😐

That's the shortest i could haha, and thanks for stepping by my friend! 😄