This free firewall is simple in use and it's intended to protect your computer from hackers and harmful network traffic.
Firewall (synonyms: brandmauer, internetwork monitor) - it's a complex of hardware and/or software tools, which control and filter moving through it net packages of datas according to the given rules.
In other words firewall doesn't pass to your computer everything which it consider dangerous. As a rule firewall lets you to choose what to consider dangerous, and advices you to allow or forbid execution for each program or process at your computer.
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Related Link: Brandmauer Comodo Firewall