Brian Cryer's Glossary of IT Terms with Links

Firewall

Firewall

A program (or set of programs and/or hardware) that prevents unauthorised access to a network or to an individual computer.

See also: SPI.

For more information see:

• www.cryer.co.uk/resources/firewalls.htm - List of firewalls that are generally free for personal use.
• http://everything.explained.at/Firewall/ - Firewall Explained.