The concept of a firewall—a hardware or software defense against network attack—goes back to the days of mighty mainframe computers. The idea of equipping a personal computer with firewall ...

Personal firewalls are available from numerous security vendors, and Windows XP includes its own (see Windows Firewall). For home and small business networks, a router with a built-in firewall is ...

Protect your online privacy and security with VPN and Firewall. Learn how these tools can make a real difference in keeping ...

A firewall that is provided by software. It often refers to a personal firewall in a user's computer, but software firewalls may be installed in servers as well. Contrast with hardware firewall.