Zone Alarm's free firewall program is designed to help protect your computer from hackers and viruses. Basically, a firewall is like a castle wall surrounding your computer. Only those programs and users that you choose to lower the drawbridge for can enter. The rest, including harmful programs and hackers, will be unable to access your computer. There are a variety of firewall programs out there, but Zone Alarm is one of the most trusted and well-known.
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