Yahoo! Widgets are small, specific applications that you can run on your Windows or Mac OS desktop. We keep them small and specific for convenience and performance reasons. Because they are so small, Widgets need another application to run. It's the Yahoo! Widgets application, and you can download the application and a starter set of Widgets to your PC or Mac from widgets.yahoo.com.
A Widget can do almost anything, from displaying a weather forecast to playing a game. Widgets generally sit on your desktop and don't look like applications as we're used to seeing them in a standard window. Instead, Widgets tend to look like small pictures or animations.