What is the name of the program we use to 'browse' the Internet?
There are several. Here are a few:
Internet Explorer (various versions)
http://www.microsoft.com/windows/products/winfamily/ie/default.mspx
Mozilla's Firefox
http://www.mozilla.com/en-US/firefox/
Opera
http://www.opera.com/
Safari
http://www.apple.com/safari/
Netscape
http://browser.netscape.com/
If you're looking for a more general term, "Web Browser"
Matt