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What is "Firewall" anyway?

A personal Firewall Software is traditionally a piece of software installed on an end-user's PC which controls communications to and from the user's PC, permitting or denying communications based on a security policy.

A Firewall Software differs from a conventional firewall in that there is no hardware separation between the firewall software on the user's PC and the user's application software. A personal Firewall Software will not usually protect any more than the one PC it is connected to, unless other PCs are sharing Internet connectivity via the protected PC.

Another distinction from conventional "firewall software"/devices is that personal firewalls are able to control communications using methods such as prompting the user each time a connection is attempted, and 'learning' from the responses, to determine what Internet traffic a user would like to permit to/from their PC.

This Firewall Software may also provide some level of intrusion detection, allowing the software to terminate or block connectivity where it suspects an intrusion is being attempted.

Personal firewalls programs are basically used for rotecting your computer from intrusion (scanning or attack) by hackers or script kiddies while it is connected to the Internet.

How 'Firewall Software' can help me?

A personal firewall can: Prevent programs that are useful for non-network purposes, like Windows Media Player, from accessing the network. Prevent nuisance accesses like PeerGuardian provides. Prevent applications providing local network services like X Window from being accessed by other computers.

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