In the past, modifying your blog sidebar required mucking around with your theme code, and even knowing a bit of PHP. Fortunately, WordPress widgets eliminate the hassle by allowing bloggers to easily configure a custom sidebar with drag-and-drop ease.
The WordPress community has developed a large and growing collection of widgets that will allow you to plug all sorts of things into your WordPress sidebar. From Flickr photos to your Twitter status, if there’s something you’d like to add to your blog sidebar, chances are there’s a widget to help you do it.
This video is an introduction to using WordPress Widgets. Additionally, you’ll learn what to do when widgets suddenly vanish — a probably that may occur unexpectedly when you change themes.