Article What is a Firewall?

[muckshifter]

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What is a Firewall? - What is a Firewall?

A personal firewall is a software application which filters traffic entering or leaving your computer.

When you're connected to the Internet, information is flowing to and from your PC in a near-constant stream through your PC's "ports". There are thousands of "ports" and they are like little gates that let information in and out.

Some of the information moving through the ports is obvious to you. For example, when you :

• Send and receive emails
• Access a website
• Fill in...

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