Widget:
- A small application designed to reside on a PC desktop or within a web-based portal or social network site offering useful or entertaining functionality.
 
These also appear on many blogs, even having a few in my sidebar.  WordPress refers to any sidebar module as a widget, and there are millions of widgets out there.  A great blog I read that keeps me up-to-date with what new widgets are coming out and what new released versions is Widgets Lab.
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Glossary Definition From ABC’s of Online Marketing by Alexandra Wharton, Issue 22, Revenue Magazine
				