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A firewall is a security measure that prevents hackers and outside sources from successfully attacking your computer, by examining all communication between your computer and outside sources. If a threat is perceived, the firewall will block the communication. A firewall can be hardware or software. Your web hosting company needs to have a firewall in order to protect anyone from destroying or damaging the websites hosted on their servers. You should have a personal firewall (usually software) to protect your personal computer from being breached. Although firewall software is good protection, there is still not a 100% guarantee that your system won't be vulnerable. Make sure you install firewall software updates regularly because new threats occur all the time and you want to have the latest security.