What’s the difference between UX and UI design?

What’s the difference between UX and UI design?

A few days ago, I published a post on Typography, a post on Color Theory, and a post on designing mobile apps from scratch. They received a good amount of attention, and people shared with me how helpful the posts were to them in understanding design better.
So, I decided to write another post that’s a quick introduction to two very broad topics: User Interface Design and User Experience Design. The knowledge from previous articles and this one can help you become a better designer.