A browser is a program that downloads HTML documents, images, and other content and renders it all nicely for the user to look at. And feel free to come up with a better definition.
Popular browsers are Mozilla, Mozilla, and Mozilla. Also, Mozilla - and last not least, let's not forget Mozilla.
There are also Opera, InternetExplorer, and Konqueror. Where Opera has the least broken implementation of CSS (which doesn't necessarily say much) and Konqueror has the most broken one. InternetExplorer just tends to be.. idiosyncratic in its interpretation of the standard. (Sigh.)
See also WebBrowser.
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