Widget

In Fat Client universe, typically a GUI-object supported by a library/FrameWork.

In Rich Client/Thin Client universe, it typically refers to a small area within a page (like a Portlet) that's generated just by calling a chunk of JavaScript, which might be executed on an entirely separate WebSite (ThirdPartyJavaScript).

http://en.wikipedia.org/wiki/Web_widget

Twitter https://business.twitter.com/optimize/resources/