jQuery UI is a curated set of user interface interactions, effects, widgets, and themes built on top of the jQuery JavaScript Library that can be used to build interactive web applications.
jQuery is the core library. jQueryUI is built on top of it. If you use jQueryUI, you must also include jQuery.
Note: If you have any questions to add to this list then please put it comments. We will be glad to add them in this list. We will be keep on updating this list with new questions and share the updates on our Facebook or Twitter channel. If you are not following us then request you to please follow and stay updated.