Google has released a plug-in for Internet Explorer 6, 7, and 8 called Google Chrome Frame that brings Google Chrome’s rendering engine inside IE. This open source plug-in practically turns IE into Chrome, so users of Internet Explorer can as well try web applications like Google Wave from their favorite web browser. Google Chrome Frame compensates the absence of features like HTML5 and open web technologies that are available in modern browser. Developers can enable Chrome plug-in for IE by adding this single meta tag in their HTML code:
If Chrome Frame is not present, the page rendering will be like any “normal” IE.
Here is a video explanation of what Chrome Frame is supposed to do
via [Google Operating System]