In general, a widget is a piece of reusable code, pluggable into virtually any website. On the other hand, a gadget acts just like a widget, it's a small technological object that has a particular function.
The plugin Netvibes Widget provides the capability to show any widget from Netvibes in websites. A widget is an element of a graphical user interface (GUI) that displays an information arrangement changeable by the user. Netvibes is a multi-lingual Ajax-based personalized start page or personal web portal. You could find an ecosystem at http://eco.netvibes.com/widgets, the largest widget directory.
Also, you can publish the widget
Astrofiles.net, for example, in any page through the plugin Netvibes Widget. ...