You can take a tour of the jQuery UI plugin by heading on over to http://www.jqueryui.com.
The UI plugin offers a set of standardized widgets, interactions, and effects. Let's take a look at each type of offering in detail.
The term "widget" within jQuery is a bit different from a WordPress widget, which is a small plugin designed to sit nicely in a sidebar of a theme. Within jQuery's UI plugin, widgets describe a set of fully-featured, user interface controls that are commonly needed in projects and created by jQuery developers. The UI widgets save jQuery developers a lot of time writing jQuery statements and chaining functions together to create the same interface and effect. Here are the interface widget's jQuery UI offers: