We have been using jQuery libraries in Web Development projects for a few years now. We build image galleries, transitions, text animations and more. It has been, for web design, a good start to replacing the interactivity of Flash, which I personally have used for years. Roll forward to the implementation of Mobile Development we are taking libraries like these and building both mobile versions of web sites we have built and also use some of the code in building iOS and android apps as well. Check it out is pretty cool!