Kendo UI provides a single package solution for building web applications with JavaScript, HTML5 and CSS3. It includes UI widgets, frameworks, and tools for data binding, visualization and building mobile apps. Kendo UI uses the MVVM pattern to separate data models from views through ViewModels. It includes ObservableObject and ObservableArray classes to enable two-way data binding between UI elements and data. Validation capabilities are also provided to augment HTML5 form validation and make it work consistently across browsers.