Firewall 

Your computer on the internet will access data from your phone line through software ports . At any one time ports can be open or closed.

A hacker will try and access your pc through a open software port he see's available . A Firewall software will hide all software ports and thus your pc won't be visible on the network.

Firewall software will only allow communications that you specify.

If a hacker does see a open port on your pc he can use it to plant either a virus or a trojan horse on your pc .These can steal personal information , bank account numbers and passwords without your knowledge. This is why a firewall software is a MUST such as "McAfee Firewall™" or "Norton Firewall™" for internet user's are highly recommended click the links above for more details.

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Revised: February 04, 2010