Understanding what firewalls do (and don’t do) takes just a few minutes. Learn what a firewall does to keep intruders out in A firewall is a security protocol that protects your internal network from ...

A proxy firewall is a network security system that protects network resources by filtering messages at the application layer. It is also called an application firewall or gateway firewall and is the ...

A virtual firewall is a firewall device or service that provides network traffic filtering and monitoring for virtual machines (VMs) in a virtualized environment. Like a traditional network firewall, ...

Pranay Parab is an independent tech journalist based in Mumbai, India. He covers tech for Lifehacker, and specializes in tutorials and in-depth features. A firewall is an essential security tool for ...