jQuery UI is a collection of GUI widgets, animated visual effects, and themes implemented with jQuery (a JavaScript library), Cascading Style Sheets, and HTML.

Pinterest, PayPal, IMDb, HuffPost, and Netflix are utilizing the library.

[6][8] As of October 7, 2021 jQuery UI is in maintenance mode, with no new features being planned.

jQueryUI comes with fully themeable widgets using a consolidated, coordinated theme mechanism,[11] such as Autocomplete, Datepicker, ProgressBar, Sliders, and more.

Effects include color animations, class toggling.