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Firewalls are devices that help protect computers from unauthorized access by the Internet. There are many different types of firewalls, but the two most common are network firewalls and personal firewalls.

Network firewalls are used to protect a computer network from unauthorized access. They work by filtering traffic that passes through the firewall.

Network firewalls can be used to protect a single computer or a whole network.

Personal firewalls are used to protect a computer from unauthorized access by the user. They work by allowing authorized users to access the computer, but blocking unauthorized users.

Personal firewalls can be installed on a single computer or on a network of computers.

The two most common types of firewalls are network firewalls and personal firewalls. Network firewalls are more commonly used, but personal firewalls are better at protecting the privacy of the user.