To explain Internet Explorer users that there are better alternatives out there, Google started with the basics: a short introduction to web browsers. "The web browser is the most important piece of software on your computer because every web page runs though it," concludes Google's short video.
"A few of us at Google created WhatBrowser.org to help teach people about web browsers. We wanted to show people that they have a lot of choice in browsers, since we noticed that most people were using the browser their computers came with."
"The browser their computers came with" is an euphemism for Internet Explorer, even though Safari is another browser that fits the description.