What are widgets?
“Widgets” is just a silly buzzword for the functionality built-in to WordPress that allows you to customize the sidebar of your WordPress site without knowing HTML. You can use widgets to add a list of recent photos, comments, flickr photos, del.icio.us links, and much more. You can find your widgets in the Presentation-->Widgets subtab. You may also get access to more widget as you activate new plugins, for many of the plugins available have an associated widget -such as flickrRSS.