The Mind the Gap series bridges the gap between the manic metropolis of the computer enthusiast and the rest of us.
A browser is a software tool that enables you to look at information on the internet. Your computer comes with one as part of its operating system.
If you have Windows it will be called Internet explorer. If you have a Mac it will be Safari.
The JustEnoughTechnology advice is to stick with the browser that you have got. Make sure you install security updates. If you are using Windows you will of course be using virus protection software - keep that up to date too.
There is a global industry of alternative, generally free browsers with an enormous range of add-ons and plug-ins. A very popular one is Firefox.I use this because I use Windows, Macs and linux machines and Firefox works on them all. If I had one computer I would use its built-in browser, I paid for it, it was designed to work with the operating system so unless I had specific constraints, like being a computer journalist, why change?