What's a browser?
It's the thing you're viewing this on. Examples include Internet Explorer, Mozilla Firefox and Google Chrome.
also Apple's Safari, Opera, Lynx, and others.
Firefox, Chrome, and Opera have versions that run on most computers that can be downloaded (at your own risk, though if you get it from the official site, it's tiny).
e.g. Google 'download firefox'.
In a wider context, a computer program used to look at something,
e.g. a file browser. a process browser, ....
In a different context, a word would be comics (hi Cee! ; - ) attempt to make jokes with.