Beyond the basics

Firewalls

What is a firewall?What is a firewall?

A firewall acts as an Internet filter to protect your computer from online predators.

How to choose a firewallHow to choose a firewall

Learn about the three different types, and how to tell which is best for you.

How to keep your firewall turned onHow to keep your firewall turned on

Instructions about the firewall on the computer you're using to view this site.

Learn more about firewalls for your operating systemLearn more about firewalls for your operating system

Find information specific to the version of Windows on your computer.

Firewall FAQFirewall FAQ

Learn more about what your firewall does and doesn't do, what to do about a firewall if you have networked computers at home, and many more popular puzzlers.

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