A web browser is the software program you use to access the World Wide Web, the graphical portion of the Internet. The first browser, called NCSA Mosaic, was developed in the early '90s. The easy-to-use point-and-click interface helped popularize the Web, although few then could imagine the explosive growth that would soon occur.

The two most popular browser programs are Microsoft Internet Explorer (its icon is a blue lower case "e") and Netscape (its icon is a an "N"). There are also a few additional browsers such as Opera and Mozilla that are gaining popularity.