Mobile widgets are small, usually simple, applications built using Web technologies such as JavaScript, XML, HTML and style sheets. Widgets are stored on a handset and are executed locally by a widget engine, which may be provided by the mobile browser or as a separate tool. Most widget technologies are available on smartphones; some are available on less-capable, enhanced phones. Widgets are a form of mobile application and, as such, can be downloaded from application stores and other mobile content providers.