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What is the purpose of a Firewall?

[Q] What is the purpose of a Firewall? What does it do? [A] A Firewall is designed to restrict access to a network by selectively allowing or blocking inbound traffic to the network. It can also control abound traffic from a user or a program. A Firewall controls traffic by monitoring the various network ports. A software network port is an identified doorway (address) for communicating between a program and another communications system or program often passing through a hardware port. The network port is usually numbered and a standard network implementation will attach a port number to data it sends. The receiving implementation will guard and listen at the attached port number (doorway) to figure out which program to send data to on its system. A port may send/receive data one direction at a time (simplex) or simultaneously in both directions (duplex). These software network ports may also connect internal programs on a single computer system. If are currently operating with a firewall, you most likely have noticed that when you load certain programs on your computer, or when you start certain programs, you receive a warning from the Firewall software indicating an attempt by a program to establish an outbound connection. Most legitimate programs can be configured automatically by the Firewall to allow programs up dates and other routine tasks. Firewalls are available as Hardware devices, or as software programs that secure the communication lines that are already in place. RELATED FAQ QUESTION: What cable should I use to connect a PC to a DSL or Cable modem? Keywords: Firewall