What is a Firewall?
A firewall is a system designed to prevent unauthorized access to or from a private network. Firewalls can be implemented in both hardware and software, or a combination of both. Firewalls are frequently used to prevent unauthorized Internet users from accessing private networks connected to the Internet, especially intranets. All messages entering or leaving the intranet pass through the firewall, which examines each message and blocks those that do not meet the specified security criteria. Cheap firewall
From the two types of firewalls, software based ones are the cheapest.
This type need to be installed in your computer and then kept running in the background. The best Firewall
The best firewall is the hardware - software firewall hybrid. THis kind of firewalls are very expensive and only big companies use them to ensure security.
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