Defender Pro firewall acts as a barrier between your computer and other computers or servers on the Internet. The firewall monitors traffic between your computer and other computers preventing undesired computers from tampering with, destroying or gaining access to files on your computer.
A firewall is critical especially for computers that have high speed internet access like Cable or DSL lines because these computers are always connected to the Internet. Without a firewall, your computer can be accessed in the background without you seeing any evidence of the intrusion or the tampering of your files.
The Defender Pro firewall not only monitors and blocks certain types of network access to your computer, but it also uses Network Address Translation (NAT). NAT allows the firewall to buffer requests of information by only allowing traffic that you have requested to access your computer. Other requests will not be directed to your computers Internet address.