|They are just different web browsers which are used for the same purpose, giving you more choice about which one to use.|
Chrome is said to be quicker than IE at downloading pages, but if you have a fast broadband connection you won't notice much difference.
Chrome is also much more customisable with add-ons & extensions which extend the capabilities of Chrome, change it's appearance, or allow you to get things done more conveniently.
The "default browser" is whatever browser you set to be used automatically when you click on a hyperlink in an email message for example. "Default" only applies if you've got more than one browser installed, obviously.
On a final note, IE must be used to access some Microsoft websites like Windows Update. You can't use Chrome for that because it doesn't understand Microsoft's ActiveX technology, neither does Firefox.
message edited by phil22