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# jQuery UI Usage Once you have downloaded jQuery UI, you will get a zip package containing the following files: * `/css/` * `/development-bundle/` * `/js/` * `index.html` ## Using jQuery UI on a Web Page Open `index.html` in a text editor, and you will see references to some external files: a theme, jQuery, and jQuery UI. Typically, you need to reference these three files in your page to use jQuery UI's widgets and interactions: Once you have referenced these necessary files, you can add some jQuery widgets to your page. For example, to create a datepicker widget, you need to add a text input to your page and then call `.datepicker()`, as shown below: **HTML:** **JavaScript:** $( "#date" ).datepicker();  For live demos of jQuery UI widgets and interactions, please visit (#).