Most PC users have had a firewall installed on their PC since they purchased their computer. In case you are wondering whether you should have one installed as well, then let me tell you that you definitely need one if you have Internet access on your computer. It is true that when you surf the Web you become visible to the rest of the world.
You might be visible to anyone who has a chance to obtain your IP address including hackers and spammers. You are visible simply because your ports might be open. The purpose of a firewall is to close those ports that you are not currently using so that nobody will have access to them. If you want to be really well protected, then make sure that you are using a router as well.
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