jQuery UI provides a comprehensive set of core interaction plugins, UI widgets and visual effects that use a jQuery-style, event-driven architecture and a focus on web standards, accessiblity, flexible styling, and user-friendly design. All plugins are tested for compatibility in IE 6.0+, Firefox 3+, Safari 3.1+, Opera 9.6+, and Google Chrome.

comprehensive set of core interaction plugins are divided into four gropus

• Interactions
  Complex behaviors like drag and drop, resizing, selection and sorting.
  • Draggable
  • Droppable
  • Resizable
  • Selectable
  • Sortable
• Widgets
  Full-featured UI controls — each has a range of options and is fully themeable.
  • Accordion
  • Autocomplete
  • Button
  • Dialog
  • Progressbar
  • Slider
  • Tabs
• Utilities
  Low-level utilities for building rich interactions, widgets, and effects.
  • Position
• Effects
  Animated transitions and easing for rich interactions.
  • Effect, Show, Hide, Toggle, Color animation, Add class, Remove class, Toggle class, Switch class