Hardware v/s Software Firewall

What is the difference between a hardware security firewall device like a router and a software security firewall like Norton’s Internet security?

The term firewall is a blanket term describing security measures that protect a network and are implemented in hardware or software. The hardware firewall in a firewall router protects an entire network. Software firewalls implemented on individual computers protect the computers themselves. If you have both a firewall router and firewalls installed on your computers, the different firewalls will work at the same time; they won’t interfere with each other.

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