Google gadgets are small modules of functionality (e.g. a clock, a game, etc.) that can be added to Blogger blogs, Google’s personalized iGoogle pages, and other places on the web. You can even add them to your own website. Most users of Blogger are familiar with at least three of these objects. The default list of Blogger templates automatically come with Followers, Blog Archive, and About Me gadgets installed. The Followers gadget allows people to connect themselves to blogs by signing on as followers. The Blog Archive gadget displays old blog posts. The About Me gadget displays a blogger’s profile.
There are hundreds of thousands of gadgets that have been developed and made publicly available. Google has a directory of gadgets that can be added to your Blogger site or to a website hosted outside of Blogger. It’s obvious that Google promotes the development of new gadgets. They have even developed an extensive programming interface to allow independent web developers to tap in to their system.
What is a Google Gadget?
Google gadgets are made up ultimately of an XML file, which gives instructions to Google regarding the configuration of your gadget. To submit a gadget to Google, you simply enter the URL of the location where your gadget XML file exists and click submit. Google finds your gadget, verifies that it works correctly, and then adds your gadget to its database so that it can be presented to millions of gadget users across the Internet.
Gadgets can be as simple as a line of text, as in the following “Hello, world” example:
<?xml version=”1.0″ encoding=”UTF-8″ ?>
<ModulePrefs title=”hello world example” />
Google publishes a fair amount of technical information to help gadget developers. You can read more information about developing gadgets at Google’s gadget page: http://code.google.com/apis/gadgets/