Difference of UX and UI

I found this little video while looking up information and tutorials on youtube about writing code for html and css (which I am currently not a fan and if you have any video or websites to help me understand they would be most appreciated). The video is very short and very introductory but it is the foundation to ux and ui. If you are still struggling with this idea then this video is for you. I hope that if nothing else this video makes you laugh. Take a study break and enjoy!

http://www.youtube.com/watch?v=2wZUTe70w1Y