In the physical world, a firewall is a wall designed specifically to stop or prevent the spread of existing or approaching flames. When a threatening fire reaches the firewall, the wall maintains its ground and protects what's behind it. Windows Defender does the same thing, except with data—or more specifically, data packets.

Differences Between Hardware & Software Firewalls - Webopedia Jun 24, 2010 What is a Firewall? - YouTube Jun 16, 2019 Firewall dictionary definition | firewall defined

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Nov 21, 2018 · The built-in Windows Firewall does half the job, and the firewall within your security suite takes care of the rest. The era of the computer hobbyist who'd carefully and lovingly select each Aug 20, 2016 · According to one, a computer firewall is a system that’s designed to prevent third parties from accessing your computer — most probably using the Internet or other means of network. Most Operating Systems are using software-based network firewalls, though a hardware-based variant is available in the industry. The latter, however, is used Introduction of Firewall in Computer Network A firewall is a network security device, either hardware or software-based, which monitors all incoming and outgoing traffic and based on a defined set of security rules it accepts, rejects or drops that specific traffic.