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A firewall is a program or device that is used to control access to a computer or network. It sits between a restricted system and the Internet, so all traffic in or out must flow through it.
Firewalls work like security guards to protect a computer. The firewall uses policies set by the firewall’s user to determine whether to allow the computer to access sites or other computers on the Internet.
If a computer has no firewall, nothing is controlling who and what can enter and leave. When you connect a computer to a network, including the Internet, your system can be a target. Some things that can happen include:
Firewalls can help prevent attacks from getting through and harming your computer.
The Interhack company of Ohio provides excellent information about firewalls with this series of Frequently Asked Questions.
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