What is a Firewall?
A firewall is a tool that monitors communication to
and from your computer. It sits between your computer and the rest of the
network, and according to some criteria, it decides which communication to
allow, and which communication to block. It may also use some other criteria to
decide about which communication or communication request to report to you
(either by adding the information to a log file that you may browse whenever
you wish, or in an alert message on the screen), and what not to report.
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