A Firewall is, actually, pretty much the same as its non-tech definition. A firewall, in building construction, is set up to contain or prevent fire from traveling from one side of the wall to the other - an extra bit of protection, if you will. A firewall on your pc does, essentially, the same thing.

Seven Design Avenue describes a firewall this way:

A firewall is a safeguard utilized by many Local Area Networks (LANs) or Wide Area Networks (WANs) to protect the network from unauthorized access from the outside. They are basically gates that verify the users before they leave or enter the network by way of a User ID, Password or IP address.

bytown internet explains it another way:

A Firewall is a system which limits network access between two or more networks. Normally, a Firewall is deployed between a trusted, protected private network and an untrusted public network. For example, the trusted network might be a corporate network (ie: Queens Universi

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o contain or prevent fire from traveling from one side of the wall to the other - an extra bit of protection, if you will. A firewall on your pc does, essentially, the same thing.

Seven Design Avenue describes a firewall this way:

A firewall is a safeguard utilized by many Local Area Networks (LANs) or Wide Area Networks (WANs) to protect the network from unauthorized access from the outside. They are basically gates that verify the users before they leave or enter the network by way of a User ID, Password or IP address.

bytown internet explains it another way:

A Firewall is a system which limits network access between two or more networks. Normally, a Firewall is deployed between a trusted, protected private network and an untrusted public network. For example, the trusted network might be a corporate network (ie: Queens Univers

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this way:

A firewall is a safeguard utilized by many Local Area Networks (LANs) or Wide Area Networks (WANs) to protect the network from unauthorized access from the outside. They are basically gates that verify the users before they leave or enter the network by way of a User ID, Password or IP address.

bytown internet explains it another way:

A Firewall is a system which limits network access between two or more networks. Normally, a Firewall is deployed between a trusted, protected private network and an untrusted public network. For example, the trusted network might be a corporate network (ie: Queens Univers

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erify the users before they leave or enter the network by way of a User ID, Password or IP address.

bytown internet explains it another way:

A Firewall is a system which limits network access between two or more networks. Normally, a Firewall is deployed between a trusted, protected private network and an untrusted public network. For example, the trusted network might be a corporate network (ie: Queens Univers

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ss between two or more networks. Normally, a Firewall is deployed between a trusted, protected private network and an untrusted public network. For example, the trusted network might be a corporate network (ie: Queens University), and the public network might be the Internet. A Firewall might grant or revoke access based on user Authentication, source and destination network addresses, network protocol, time of day, network service or any combination of these. These settings are normally controlled by the Network Administrator.

So how can a firewall help you - the average, home user?

By giving an extra level of blocking protection against spam, viruses and other malware.

Those lucky enough to be running WinXP SP2 (that's Windows XP, Service Pack 2) already have a built-in firewall that they can use. All they have to do is turn it on. Here's how to make sure you have SP2 and your firewall turned on:

How do I know if I'm running Windows XP? Easy enough. On your Desktop, right-click once on My Computer and choose "Properties". The little window that pops up should tell