jQuery Mobile is a user interface framework, built on top of jQuery, designed to simplify the process of building applications that target mobile devices.

jQuery mobile framework takes the “write less, do more” mantra to the next level: Instead of writing unique apps for each mobile device or OS, the jQuery mobile framework will allow you to design a single highly branded and customized web application that will work on all popular smartphone and tablet platforms.

jQuery Mobile is built completely around the principle of progressive enhancement: taking a fully functional HTML web page, layering on additional JavaScript functionality, and giving capable browsers a top-of-the-line experience.

It uses HTML 5 and CSS 3 features to provide the best possible experience in the most-capable browsers, it degrades well for the non-capable browsers.