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Definition [Firewall]

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A firewall is software or hardware that monitors information coming from the Internet or a network, and then either blocks it or allows it to pass through to your computer or web server, depending on your firewall settings. A firewall can help prevent hackers or malicious software from accessing your computer or web server through a network or the Internet. A firewall can also help stop your computer from transmitting malicious software to other computers or web servers in the same network or on the internet.