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Firewall | Surveillance Self-Defense
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Surveillance
Self-Defense
Self-Defense
Firewall
A tool that protects a computer from unwanted connections to or from local networks and the internet. A firewall 
might have rules that forbid outgoing email, or connections to certain websites. Firewalls can be used as a first line of defense to protect a device from unexpected interference. They can also be used to prevent users from accessing the internet in certain ways.