jQuery Mobile is a mobile web framework and cross-platform UI library designed to create consistent HTML5 user interfaces that adapt to different mobile device platforms and screen sizes. It provides a collection of customizable components and CSS styles to render a unified look and feel across various mobile operating systems.
The framework functions as a CSS themeable UI kit, featuring a build process that allows for the generation of custom visual themes by modifying base style files and assets.
The library covers a broad capability surface including responsive mobile interface development, custom web theme design, and frontend asset optimization.